60 lines
937 B
Plaintext
60 lines
937 B
Plaintext
DROP TABLE IF EXISTS t1,t2;
|
|
CREATE TABLE t1 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=xengine;
|
|
INSERT INTO t1 (a,b) VALUES (10000,'foobar'),(1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e');
|
|
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
|
|
CREATE TABLE t2 (pk INT AUTO_INCREMENT PRIMARY KEY, c CHAR(8), d INT) ENGINE=xengine;
|
|
INSERT INTO t2 (c,d) SELECT b, a FROM t1;
|
|
SELECT a,b FROM t1;
|
|
a b
|
|
1 a
|
|
1 a
|
|
10000 foobar
|
|
10000 foobar
|
|
2 b
|
|
2 b
|
|
3 c
|
|
3 c
|
|
4 d
|
|
4 d
|
|
5 e
|
|
5 e
|
|
SELECT c,d FROM t2;
|
|
c d
|
|
a 1
|
|
a 1
|
|
b 2
|
|
b 2
|
|
c 3
|
|
c 3
|
|
d 4
|
|
d 4
|
|
e 5
|
|
e 5
|
|
foobar 10000
|
|
foobar 10000
|
|
DELETE IGNORE FROM t1 WHERE b IS NOT NULL ORDER BY a LIMIT 1;
|
|
SELECT a,b FROM t1;
|
|
a b
|
|
1 a
|
|
10000 foobar
|
|
10000 foobar
|
|
2 b
|
|
2 b
|
|
3 c
|
|
3 c
|
|
4 d
|
|
4 d
|
|
5 e
|
|
5 e
|
|
DELETE IGNORE t1.*, t2.* FROM t1, t2 WHERE c < b OR a != ( SELECT 1 UNION SELECT 2 );
|
|
Warnings:
|
|
Warning 1242 Subquery returns more than 1 row
|
|
SELECT a,b FROM t1;
|
|
a b
|
|
1 a
|
|
SELECT c,d FROM t2;
|
|
c d
|
|
foobar 10000
|
|
foobar 10000
|
|
DROP TABLE t1, t2;
|