Inserting a Zero Value In an AUTO_INCREMENT Column (Doc ID 2135717.1)

Last updated on JUNE 09, 2016

Applies to:

MySQL Server - Version 4.0 and later
Information in this document applies to any platform.
Zero is used as a literal value for auto_increment columns

Symptoms

The manual states on an INSERT into an auto_increment column, 0 is treated exactly in the same way as NULL, that is, 0 should be replaced with the next sequence number.

Yet '0' itself is inserted:

mysql> CREATE TABLE t2 (a int AUTO_INCREMENT, b int, primary key (a)) engine=innodb;

mysql> insert into t2 (a,b) values(0,0);

Query OK, 1 row affected (0.01 sec)

mysql> select * from t2;
+---+---+
| a | b |
+---+---+
| 0 | 0 |
+---+---+

Cause

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