Update data using IF in mysql and define 'dont do anything' when if false

Question

Im trying to use IF query in update some entire row in my mysql table. As known IF query have 3 parameters. Part 1 of what you looking for, part 2 if its found / true and part 3

Answer 1

You're confusing an update with a condition with a conditional update. For example the following is an update with a condition:

UPDATE x SET y=IF(a=b, c, d)

This is a conditional update:

UPDATE x SET y=c WHERE a=b

The first version is applied to all rows, the second to all matching rows.

Use a WHERE clause to limit what rows your UPDATE is applied to.