mysql - 如何在 MySQL 中重置 AUTO_INCREMENT

Question

我如何重置字段的AUTO_INCREMENT？

我希望它再次从 1 开始计数。

Answer 1

您可以使用以下方法重置计数器:

ALTER TABLE tablename AUTO_INCREMENT = 1

对于 InnoDB您不能将 auto_increment 值设置为低于或等于当前最高索引。 (引自 ViralPatel ):

Note that you cannot reset the counter to a value less than or equalto any that have already been used. For MyISAM, if the value is lessthan or equal to the maximum value currently in the AUTO_INCREMENTcolumn, the value is reset to the current maximum plus one. ForInnoDB, if the value is less than the current maximum value in thecolumn, no error occurs and the current sequence value is not changed.

见 How can I reset an MySQL AutoIncrement using a MAX value from another table? 关于如何动态获取可接受的值。