DateTime的SQL自动递增

Question

我的sql中有没有办法按日期和时间自动递增？

所以说我有一张桌子

                         mytable
 =====================================================
 = Comment_ID = First_Name =  Comment  =  DateTime   =
 =====================================================
 =     1     =      Bob   =  FooBar = 11-01-14 11:00 =
 =     2     =     Jack   =  Blah   = 11-01-14 12:29 =
 =     3     =     John   =  jonny  = 12-01-14 07:09 =
 =====================================================

有没有让日期自动增加？

Answer 1

在MySQL中运行：

ALTER TABLE `mytable` 
CHANGE COLUMN `DateTime` `DateTime` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ;

这会将您的默认值设置为CURRENT_TIMESTAMP。

Answer 2

您可以为日期时间列now()设置默认值。这样，无论何时添加行，它都会自动获取当前日期时间。