如何在MySQL中动态设置从00:00开始的昨天日期？

Question

I want to dynamically set in mysql this:

2017-07-26 00:00:00

for yesterday's time, like I do with now() for now.

How to do this?

Answer 1

You can use MySQL's DATE function to extract date part from datetime, eg:

SELECT DATE(NOW());

This will give you current date without time.

If you want yesterday's date, you can use DATE_ADD to subtract 1 day and use DATE function on the result to get the date without time, eg:

SELECT DATE(DATE_ADD(NOW(), INTERVAL -1 DAY));

Here's the documentation for DATE and DATE_ADD functions.

Update

If you want seconds as 00:00:00 then you can use CONCAT method, eg:

SELECT CONCAT(DATE(DATE_ADD(NOW(), INTERVAL -1 DAY)), ' 00:00:00');

Answer 2

您可以使用TIMESTAMP()函数将日期转换为带有00:00:00作为时间部分的时间戳：

select timestamp(curdate() - interval 1 day);