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Or Mysql problem

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I was wondering how i can count all the rows in a table where the `ID` field equals '1' and the `to_id` field equals '2', or where the `ID` field equals 1 and the `from_id` field equals '3'.

This is what i have but it doesn't work:

[code=php:0]$count = mysql_num_rows(mysql_query("SELECT * FROM `mail` WHERE (`ID` = '1' AND `to_id` = '2') OR (`ID` = '1' AND `from_id` = '3')"));[/code]

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