7 lines
244 B
Plaintext
7 lines
244 B
Plaintext
DROP TABLE IF EXISTS t1;
|
|
CREATE TABLE t1(a INT NOT NULL, b INT) ENGINE = INNODB;
|
|
INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4);
|
|
ALTER TABLE t1 ADD PRIMARY KEY(b), ADD UNIQUE INDEX(a);
|
|
ERROR 23000: Duplicate entry '1' for key 'a'
|
|
DROP TABLE t1;
|