diff options
Diffstat (limited to 'mysql-test/r/distinct.result')
| -rw-r--r-- | mysql-test/r/distinct.result | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/mysql-test/r/distinct.result b/mysql-test/r/distinct.result index 89b17d69f40..a2ff10594e6 100644 --- a/mysql-test/r/distinct.result +++ b/mysql-test/r/distinct.result @@ -504,6 +504,57 @@ a 2 b 2 2 4 3 2 5 DROP TABLE t1,t2; +CREATE TABLE t1(a INT PRIMARY KEY, b INT); +INSERT INTO t1 VALUES (1,1), (2,1), (3,1); +EXPLAIN SELECT DISTINCT a FROM t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL PRIMARY 4 NULL 3 Using index +EXPLAIN SELECT DISTINCT a,b FROM t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1_1 ALL NULL NULL NULL NULL 3 Using temporary +1 SIMPLE t1_2 index NULL PRIMARY 4 NULL 3 Using index; Distinct +EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2 +WHERE t1_1.a = t1_2.a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1_1 ALL PRIMARY NULL NULL NULL 3 Using temporary +1 SIMPLE t1_2 eq_ref PRIMARY PRIMARY 4 test.t1_1.a 1 Using index; Distinct +EXPLAIN SELECT a FROM t1 GROUP BY a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL PRIMARY 4 NULL 3 Using index +EXPLAIN SELECT a,b FROM t1 GROUP BY a,b; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 3 +CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b)); +INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4); +EXPLAIN SELECT DISTINCT a FROM t2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index +EXPLAIN SELECT DISTINCT a,a FROM t2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index; Using temporary +EXPLAIN SELECT DISTINCT b,a FROM t2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index +EXPLAIN SELECT DISTINCT a,c FROM t2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary +EXPLAIN SELECT DISTINCT c,a,b FROM t2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 ALL NULL NULL NULL NULL 3 +EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort +CREATE UNIQUE INDEX c_b_unq ON t2 (c,b); +EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t2 ALL NULL NULL NULL NULL 3 +DROP TABLE t1,t2; create table t1 (id int, dsc varchar(50)); insert into t1 values (1, "line number one"), (2, "line number two"), (3, "line number three"); select distinct id, IFNULL(dsc, '-') from t1; |