Question

Hi I have a table that have timestamp column. I want to update a date with 1 second before of it. How can I do that?

Exp:
name | date
ibrahim |
2011-04-14 03:35:05
blabla |
2011-04-14 03:00:00
.
.
.

After update, date of second row should be “2011-04-14 02:59:59” etc.

edit:

answer is

UPDATE table SET
date=DATE_SUB(date,INTERVAL 1 SECOND)
WHERE name=”blabla”;

Answer 1

Use DATE_SUB(date,INTERVAL expr unit) function.

or

update `table` set date_date = date_date - INTERVAL 1 SECOND;