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Error 1062: Duplicate entry for key

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Error CodeSQLSTATEErrorDescription
106223000ER_DUP_ENTRYDuplicate entry '%s' for key %d

Contents

  1. Possible Causes and Solutions

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');
Query OK, 2 rows affected (0.027 sec)
Records: 2  Duplicates: 0  Warnings: 0

SELECT * FROM t1;
+----+------+
| id | f    |
+----+------+
|  1 | a    |
|  2 | b    |
+----+------+
2 rows in set (0.000 sec)

INSERT INTO t1 (f) VALUES ('b'),('c');
ERROR 1062 (23000): Duplicate entry 'b' for key 'f'

Solve the error by either not requiring the key to be unique, or by not attempting to insert a duplicate value.

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