如何将datetime列拆分为日期和时间，并在MySQL中分别进行比较？

2026-06-04 1 花语

让我们首先创建一个表-

create table DemoTable805(LoginDate datetime);

使用插入命令在表中插入一些记录-

insert into DemoTable805 values(2019-01-31 12:45:20); insert into DemoTable805 values(2017-11-01 10:20:30); insert into DemoTable805 values(2016-03-12 04:10:00); insert into DemoTable805 values(2018-12-24 05:01:00);

使用select语句显示表中的所有记录-

select *from DemoTable805;

这将产生以下输出-

+---------------------+ | LoginDate | +---------------------+ | 2019-01-31 12:45:20 | | 2017-11-01 10:20:30 | | 2016-03-12 04:10:00 | | 2018-12-24 05:01:00 | +---------------------+ 4 rows in set (0.00 sec)

这是将DateTime列拆分为日期和时间并单独比较的查询-

select cast(LoginDate AS date),cast(LoginDate AS Time) from DemoTable805;

这将产生以下输出-

+-------------------------+-------------------------+ | cast(LoginDate AS date) | cast(LoginDate AS Time) | +-------------------------+-------------------------+ | 2019-01-31 | 12:45:20 | | 2017-11-01 | 10:20:30 | | 2016-03-12 | 04:10:00 | | 2018-12-24 | 05:01:00 | +-------------------------+-------------------------+ 4 rows in set (0.03 sec)