MySQL 默认日期时间通过 phpmyadmin-数据库问题

MySQL default datetime through phpmyadmin(MySQL 默认日期时间通过 phpmyadmin)

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问题描述

在现有数据库中，我有年龄列 (INT).现在我需要将它设置为 dob (DATETIME).

我尝试通过 PHPMyAdmin 这样做，将 CURRENT_TIMESTAMP 作为查看区别.

词来自 this 博客

数据类型规范中的 DEFAULT value 子句指示列的默认值.除了一个例外，默认值必须是一个常量；它不能是函数或表达式.

这意味着，例如，您不能将日期列的默认值设置为 NOW() 或 CURRENT_DATE 等函数的值.

例外情况是您可以将 CURRENT_TIMESTAMP 指定为 TIMESTAMP 列的默认值.

In an existing database, I've age column (INT). Now I need to set it as dob (DATETIME).

I try doing so through PHPMyAdmin, giving CURRENT_TIMESTAMP as default value as defined by answer with 138 upvotes. However PHPMyAdmin is complaining #1067 - invalid default value for 'dob' as in attached screenshot:

Can someone please suggest why I'm getting that error and how to fix that?

解决方案

You can't set CURRENT_TIMESTAMP as default value with DATETIME.

But you can do it with TIMESTAMP.

See the difference here.

Words from this blog

The DEFAULT value clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression.

This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE.

The exception is that you can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP column.

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