diff options
Diffstat (limited to 'mysql-test/t/join_nested.test')
| -rw-r--r-- | mysql-test/t/join_nested.test | 693 |
1 files changed, 693 insertions, 0 deletions
diff --git a/mysql-test/t/join_nested.test b/mysql-test/t/join_nested.test new file mode 100644 index 00000000000..245ea3dccf0 --- /dev/null +++ b/mysql-test/t/join_nested.test @@ -0,0 +1,693 @@ + + +DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5,t6,t7,t8,t9; + +CREATE TABLE t0 (a int, b int, c int); +CREATE TABLE t1 (a int, b int, c int); +CREATE TABLE t2 (a int, b int, c int); +CREATE TABLE t3 (a int, b int, c int); +CREATE TABLE t4 (a int, b int, c int); +CREATE TABLE t5 (a int, b int, c int); +CREATE TABLE t6 (a int, b int, c int); +CREATE TABLE t7 (a int, b int, c int); +CREATE TABLE t8 (a int, b int, c int); +CREATE TABLE t9 (a int, b int, c int); + +INSERT INTO t0 VALUES (1,1,0), (1,2,0), (2,2,0); +INSERT INTO t1 VALUES (1,3,0), (2,2,0), (3,2,0); +INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0); +INSERT INTO t3 VALUES (1,2,0), (2,2,0); +INSERT INTO t4 VALUES (3,2,0), (4,2,0); +INSERT INTO t5 VALUES (3,1,0), (2,2,0), (3,3,0); +INSERT INTO t6 VALUES (3,2,0), (6,2,0), (6,1,0); +INSERT INTO t7 VALUES (1,1,0), (2,2,0); +INSERT INTO t8 VALUES (0,2,0), (1,2,0); +INSERT INTO t9 VALUES (1,1,0), (1,2,0), (3,3,0); + + +SELECT t2.a,t2.b + FROM t2; + +SELECT t3.a,t3.b + FROM t3; + +SELECT t4.a,t4.b + FROM t4; + +SELECT t3.a,t3.b,t4.a,t4.b + FROM t3,t4; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t2.b=t4.b; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b; + +EXPLAIN +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t2.b=t4.b + WHERE t3.a=1 OR t3.c IS NULL; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t2.b=t4.b + WHERE t3.a=1 OR t3.c IS NULL; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t2.b=t4.b + WHERE t3.a>1 OR t3.c IS NULL; + +SELECT t5.a,t5.b + FROM t5; + +SELECT t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t3,t4,t5; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t2 + LEFT JOIN + (t3, t4, t5) + ON t2.b=t4.b; + +EXPLAIN +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t2 + LEFT JOIN + (t3, t4, t5) + ON t2.b=t4.b + WHERE t3.a>1 OR t3.c IS NULL; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t2 + LEFT JOIN + (t3, t4, t5) + ON t2.b=t4.b + WHERE t3.a>1 OR t3.c IS NULL; + +EXPLAIN +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t2 + LEFT JOIN + (t3, t4, t5) + ON t2.b=t4.b + WHERE (t3.a>1 OR t3.c IS NULL) AND + (t5.a<3 OR t5.c IS NULL); + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b + FROM t2 + LEFT JOIN + (t3, t4, t5) + ON t2.b=t4.b + WHERE (t3.a>1 OR t3.c IS NULL) AND + (t5.a<3 OR t5.c IS NULL); + +SELECT t6.a,t6.b + FROM t6; + +SELECT t7.a,t7.b + FROM t7; + +SELECT t6.a,t6.b,t7.a,t7.b + FROM t6,t7; + +SELECT t8.a,t8.b + FROM t8; + +EXPLAIN +SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10; + +SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10; + +SELECT t5.a,t5.b + FROM t5; + +SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b; + +SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b AND + (t8.a < 1 OR t8.c IS NULL); + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + WHERE t2.a > 3 AND + (t6.a < 6 OR t6.c IS NULL); + +SELECT t1.a,t1.b + FROM t1; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2); + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2) + WHERE (t2.a >= 4 OR t2.c IS NULL); + +SELECT t0.a,t0.b + FROM t0; + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2) + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL); + +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2) + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL); + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +SELECT t9.a,t9.b + FROM t9; + +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +SELECT t1.a,t1.b + FROM t1; + +SELECT t2.a,t2.b + FROM t2; + +SELECT t3.a,t3.b + FROM t3; + +SELECT t2.a,t2.b,t3.a,t3.b + FROM t2 + LEFT JOIN + t3 + ON t2.b=t3.b; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b + FROM t1, t2 + LEFT JOIN + t3 + ON t2.b=t3.b + WHERE t1.a <= 2; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b + FROM t1, t3 + RIGHT JOIN + t2 + ON t2.b=t3.b + WHERE t1.a <= 2; + +SELECT t3.a,t3.b,t4.a,t4.b + FROM t3,t4; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t1, t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b + WHERE t1.a <= 2; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t1, (t3, t4) + RIGHT JOIN + t2 + ON t3.a=1 AND t2.b=t4.b + WHERE t1.a <= 2; + +SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t1, t3, t4 + RIGHT JOIN + t2 + ON t3.a=1 AND t2.b=t4.b + WHERE t1.a <= 2; + +CREATE INDEX idx_b ON t2(b); + +EXPLAIN +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t3,t4 + LEFT JOIN + (t1,t2) + ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b; + +SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b + FROM t3,t4 + LEFT JOIN + (t1,t2) + ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b; + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +CREATE INDEX idx_b ON t4(b); +CREATE INDEX idx_b ON t5(b); + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +CREATE INDEX idx_b ON t8(b); + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +CREATE INDEX idx_b ON t1(b); +CREATE INDEX idx_a ON t0(a); + +EXPLAIN +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b, + t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b + FROM t0,t1 + LEFT JOIN + ( + t2 + LEFT JOIN + (t3, t4) + ON t3.a=1 AND t2.b=t4.b, + t5 + LEFT JOIN + ( + t6, + t7 + LEFT JOIN + t8 + ON t7.b=t8.b AND t6.b < 10 + ) + ON t6.b >= 2 AND t5.b=t7.b + ) + ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND + (t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND + (t1.a != 2), + t9 + WHERE t0.a=1 AND + t0.b=t1.b AND + (t2.a >= 4 OR t2.c IS NULL) AND + (t3.a < 5 OR t3.c IS NULL) AND + (t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND + (t5.a >=2 OR t5.c IS NULL) AND + (t6.a >=4 OR t6.c IS NULL) AND + (t7.a <= 2 OR t7.c IS NULL) AND + (t8.a < 1 OR t8.c IS NULL) AND + (t8.b=t9.b OR t8.c IS NULL) AND + (t9.a=1); + +SELECT t2.a,t2.b + FROM t2; + +SELECT t3.a,t3.b + FROM t3; + +SELECT t2.a,t2.b,t3.a,t3.b + FROM t2 LEFT JOIN t3 ON t2.b=t3.b + WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL); + +SELECT t2.a,t2.b,t3.a,t3.b + FROM t2 LEFT JOIN (t3) ON t2.b=t3.b + WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL); + +ALTER TABLE t3 + CHANGE COLUMN a a1 int, + CHANGE COLUMN c c1 int; + +SELECT t2.a,t2.b,t3.a1,t3.b + FROM t2 LEFT JOIN t3 ON t2.b=t3.b + WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL); + +SELECT t2.a,t2.b,t3.a1,t3.b + FROM t2 NATURAL LEFT JOIN t3 + WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL); + +DROP TABLE t0,t1,t2,t3,t4,t5,t6,t7,t8,t9; |