how to use if not exists while inserting a row mysql

Question

The thing that i want to do is to check if there is a same row and if not to insert a new row to the table.

In that case, how can i use if not exists ?

Answer 1

User Insert Into to ignore duplicates:

INSERT IGNORE INTO `facebook`
SET `ID` = null,
`fb_id` = '". $session['id'] ."',
`label_id` = '$id',
`page_ids`='',
`token`='". $access_token ."';