Often query for the specified time or time period when the data query or menu, for example, to query information within a day, within a week to query information, to inquire, network engineers within the company this month to introduce DATE_SUB function, combined with examples to explain, we hope to help new colleagues.
Definition and Usage
DATE_SUB () function interval from date minus a specified time.1. Grammar
DATE_SUB(date,INTERVAL expr type)date parameter is valid date expression. expr parameter is the time interval you want to add.
type parameter can be the following values:
| Type Value |
|---|
| MICROSECOND |
| SECOND |
| MINUTE |
| HOUR |
| DAY |
| WEEK |
| MONTH |
| QUARTER |
| YEAR |
| SECOND_MICROSECOND |
| MINUTE_MICROSECOND |
| MINUTE_SECOND |
| HOUR_MICROSECOND |
| HOUR_SECOND |
| HOUR_MINUTE |
| DAY_MICROSECOND |
| DAY_SECOND |
| DAY_MINUTE |
| DAY_HOUR |
| YEAR_MONTH |
Simple examples
Suppose we have the following table:| OrderId | ProductName | OrderDate |
|---|---|---|
| 1 | 'Computer' | 2012-12-29 16:25:46.635 |
We use the following SELECT statement:
SELECT OrderId,DATE_SUB(OrderDate,INTERVAL 2 DAY) AS OrderPayDate FROM Ordersresult:
| OrderId | OrderPayDate |
|---|---|
| 1 | 2012-12-27 16:25:46.635 |
查询一天：
select * from table where to_days(column_time) = to_days(now());
select * from table where date(column_time) = curdate();
查询一周：
select * from table where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(column_time);
查询一个月：
select * from table where DATE_SUB(CURDATE(), INTERVAL 1 MONTH) <= date(column_time);
查询指定天数
select * from table where DATE_SUB(CURDATE(), INTERVAL 2 DAY) <= date(column_time);
From the article: Nanchang Could Media Reprinted from: http://www.mofeimedia.com