diff options
| author | unknown <gkodinov/kgeorge@macbook.gmz> | 2007-05-29 15:58:18 +0300 |
|---|---|---|
| committer | unknown <gkodinov/kgeorge@macbook.gmz> | 2007-05-29 15:58:18 +0300 |
| commit | aff34a8c64125d5907b8b5b88e163721ded0b77a (patch) | |
| tree | 291ba8febbc6342a44e7c4737f26f91f2dd1022c /mysql-test/r/greedy_optimizer.result | |
| parent | fbaad80e0e55013a214d6314c59e9dbeb6af2af7 (diff) | |
| download | mariadb-git-aff34a8c64125d5907b8b5b88e163721ded0b77a.tar.gz | |
Bug #27531: 5.1 part of the fix
- Renamed "Using join cache" to "Using join buffer".
- "Using join buffer" is now printed on the last
table that "reads" from the join buffer cache.
mysql-test/r/archive_gis.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/compress.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/ctype_utf8.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/derived.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/distinct.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/func_group.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/func_group_innodb.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/gis.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/greedy_optimizer.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/group_by.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/group_min_max.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/index_merge_myisam.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/information_schema.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/innodb_gis.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/innodb_mysql.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/join.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/join_nested.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/key_diff.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/myisam.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/ndb_condition_pushdown.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/ndb_gis.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/range.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/row.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/select.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/ssl.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/ssl_compress.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/subselect.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/subselect3.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/union.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
mysql-test/r/view.result:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
sql/sql_select.cc:
Bug #27531: renamed "Using join cache" to "Using join buffer"
and moved to the last table in the batch.
Diffstat (limited to 'mysql-test/r/greedy_optimizer.result')
| -rw-r--r-- | mysql-test/r/greedy_optimizer.result | 440 |
1 files changed, 220 insertions, 220 deletions
diff --git a/mysql-test/r/greedy_optimizer.result b/mysql-test/r/greedy_optimizer.result index ebd2468c9af..9e8c66722e3 100644 --- a/mysql-test/r/greedy_optimizer.result +++ b/mysql-test/r/greedy_optimizer.result @@ -120,72 +120,72 @@ select @@optimizer_search_depth; 63 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value @@ -200,72 +200,72 @@ select @@optimizer_search_depth; 0 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value @@ -276,24 +276,24 @@ select @@optimizer_search_depth; 1 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value @@ -303,10 +303,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -315,10 +315,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -327,10 +327,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -339,10 +339,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -352,72 +352,72 @@ select @@optimizer_search_depth; 62 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value Last_query_cost 289.418727 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.c21 1 Using where 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value @@ -432,72 +432,72 @@ select @@optimizer_search_depth; 0 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value @@ -508,24 +508,24 @@ select @@optimizer_search_depth; 1 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value @@ -535,10 +535,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -547,10 +547,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -559,10 +559,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -571,10 +571,10 @@ id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where -1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where; Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 @@ -584,72 +584,72 @@ select @@optimizer_search_depth; 62 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c12 = t2.c21 and t2.c22 = t3.c31 and t3.c32 = t4.c41 and t4.c42 = t5.c51 and t5.c52 = t6.c61 and t6.c62 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.c22 1 +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t4.c42 1 +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t6.c62 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 821.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using index +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using index +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using index show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t1, t2, t3, t4, t5, t6, t7 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value Last_query_cost 794.837037 explain select t1.c11 from t7, t6, t5, t4, t3, t2, t1 where t1.c11 = t2.c21 and t1.c12 = t3.c31 and t1.c13 = t4.c41 and t1.c14 = t5.c51 and t1.c15 = t6.c61 and t1.c16 = t7.c71 and t2.c22 = t3.c32 and t2.c23 = t4.c42 and t2.c24 = t5.c52 and t2.c25 = t6.c62 and t2.c26 = t7.c72 and t3.c33 = t4.c43 and t3.c34 = t5.c53 and t3.c35 = t6.c63 and t3.c36 = t7.c73 and t4.c42 = t5.c54 and t4.c43 = t6.c64 and t4.c44 = t7.c74 and t5.c52 = t6.c65 and t5.c53 = t7.c75 and t6.c62 = t7.c76; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 Using join cache -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where; Using join cache -1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where; Using join cache -1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where +1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 3 +1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer +1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.c12 1 Using where +1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where; Using join buffer +1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t1.c14 1 Using where +1 SIMPLE t6 ALL NULL NULL NULL NULL 18 Using where; Using join buffer 1 SIMPLE t7 eq_ref PRIMARY PRIMARY 4 test.t1.c16 1 Using where show status like 'Last_query_cost'; Variable_name Value |