preventing duplicate rows?

["William Stokes" <kalles@xxxxxxxxxxxxx>]

Hello,

I'm updating a table with following SQL statement

 $sql = "INSERT INTO x_ikaluokat (ryhma, ikaluokka)
   VALUES ('$ryhma','$ikaluokka')";

What would be the best way to test that similar rows doesn't get created to 
the table? I can't make both columns unique.

Thanks
-Will 

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