Error 1062: Duplicate entry for key
Error Code | SQLSTATE | Error | Description |
---|---|---|---|
1062 | 23000 | ER_DUP_ENTRY | Duplicate entry '%s' for key %d |
Contents
Possible Causes and Solutions
This error occurs when a key that requires a unique value (unique or primary) instead receives a duplicate. For example:
CREATE TABLE t1 ( id INT AUTO_INCREMENT PRIMARY KEY, f VARCHAR(10) UNIQUE ); INSERT INTO t1 (f) VALUES ('a'),('b'); SELECT * FROM t1; +----+------+ | id | f | +----+------+ | 1 | a | | 2 | b | +----+------+ INSERT INTO t1 (f) VALUES ('b'),('c'); ERROR 1062 (23000): Duplicate entry 'b' for key 'f'
Solve the error by either not attempting to insert a duplicate value, or not requiring the key to be unique. For example, the below replaces the unique index with an index permitting duplicates:
ALTER TABLE t1 DROP INDEX f, ADD INDEX (f); INSERT INTO t1 (f) VALUES ('b'),('c'); SELECT * FROM t1; +----+------+ | id | f | +----+------+ | 1 | a | | 2 | b | | 3 | b | | 4 | c | +----+------+
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