How to use DATE_SUB in Mysql combined with querying information examples within one day, one week, and one month

 When querying data or menus, it is often necessary to query the specified time or time period. For example, to query the information within one day, to query the information within a week, and to query within a month, the engineers of Nanchang Website Construction Company are here to show you Introduce the DATE_SUB function, and explain it with examples, hoping to help new colleagues. 

Definition and Usage

The DATE_SUB() function subtracts the specified time interval from a date.

1. Grammar

DATE_SUB(date,INTERVAL expr type)

The date   parameter is a valid date expression. The expr   parameter is the time interval you wish to add.
The type parameter can have 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 example

Suppose we have the following table:
OrderId ProductName OrderDate

1	'Computer'	2012-12-29 16:25:46.635

Now, we want to subtract 2 days from "OrderDate".
We use the following SELECT statement:

SELECT OrderId,DATE_SUB(OrderDate,INTERVAL 2 DAY) AS OrderPayDate  FROM Orders  

Result:
OrderId OrderPayDate

1	2012-12-27 16:25:46.635

3. Complex example:

query one day:
    select * from table where to_days(column_time) = to_days(now());
    select * from table where date(column_time) = curdate(); query one week:     select * from table where DATE_SUB(CURDATE (), INTERVAL 7 DAY) <= date(column_time); Query a month:     select * from table where DATE_SUB(CURDATE(), INTERVAL 1 MONTH) <= date(column_time); Query a specified number of days     select * from table where DATE_SUB( CURDATE(), INTERVAL 2 DAY) <= date(column_time); The technicians of Nanchang Construction Website Company suggested that we can use different types according to our needs. For example, if we want to query orders within two weeks, then we can Express like this.  

SELECT * FROM Orders where DATE_SUB(CURDATE(),INTERVAL 2 WEEK) <= date(column_time)

It's that simple