Mysql Update time (plus or minus a period of time)

Source: Internet
Author: User
Tags mysql update

The MySQL time plus function defines and uses the Date_add (), Date_sub () () function to add a specified time interval to a date. The Date_sub () function reduces the specified time interval to a date. The syntax Date_add (date,interval expr type) date_sub (Date,interval expr type) is a valid date expression. The expr parameter is the time interval that you want to add. The type parameter can be the following value:
Type value
1. MySQL adds a time interval for the date: Date_add () [HTML] View plain copy
    1. Set @dt = Now ();
    2. Select Date_add (@dt, Interval 1 day); -Plus 1 days
    3. Select Date_add (@dt, interval 1 hour); -Plus 1 hours
    4. Select Date_add (@dt, interval 1 minute); -Plus 1 minutes
    5. Select Date_add (@dt, Interval 1 second); -Plus 1 seconds
    6. Select Date_add (@dt, interval 1 microsecond);-plus 1 milliseconds
    7. Select Date_add (@dt, Interval 1 week);-Plus 1 weeks
    8. Select Date_add (@dt, interval 1 month);-Plus January
    9. Select Date_add (@dt, interval 1 quarter);-Plus 1 seasons
    10. Select Date_add (@dt, interval 1 year);-Plus 1 years
Example: Update a time, plus one weeks per time [HTML] view plain copy
    1. UPDATE Comment C Set c.time = Date_add (C.time, INTERVAL 7 day);
2. MySQL for date minus one time interval: Date_sub (), formatted with Date_add () Similar example: Update a time to reduce the time by one months [HTML] View plain copy
    1. UPDATE Comment C Set c.time = Date_sub (C.time, INTERVAL 1 MONTH)
You can also use these functions when inserting data. such as updating SQL:
Update V_po_part R
Set r.otdstandardtime = Date_add (now (), Interval 1 day)
where = ' $ '
Insert sql:

Mysql Update time (plus or minus a period of time)

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