Question

MYSQL VERSION - 5.7.14

在mysql版本中，我无法在插入查询中插入null的时间戳值。

我尝试使用以下查询更改mysql中的timestamp coulmn：

ALTER TABLE `business` MODIFY `created` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL;
ALTER TABLE `business` MODIFY `modified` TIMESTAMP on update CURRENT_TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL;

但是我收到了错误 #1067 - Invalid default value for 'modified'

Answer 1

这应该有效：

// TO ALLOW NULL AND SET CURRENT_TIMESTAMP AS DEFAULT:
ALTER TABLE `business` MODIFY `created` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP;
// TO ALLOW NULL AND SET CURRENT_TIMESTAMP AS DEFAULT AND ON UPDATE:  
ALTER TABLE `business` MODIFY `modified` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;

如果您不想允许null，则只需删除NULL：

// DO NOT ALLOW NULL, SET CURRENT_TIMESTAMP AS DEFAULT:
ALTER TABLE `business` MODIFY `created` TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
// DO NOT ALLOW NULL, SET CURRENT_TIMESTAMP AS DEFAULT AND ON UPDATE:  
ALTER TABLE `business` MODIFY `modified` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;

MYSQL查询改变时间戳列

1 个答案: