NULL values

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When I do the following query in mySQL only 1 record is retrieved.  

SELECT * FROM `paypal_payment_info` WHERE `os1` NOT LIKE 'commission_paid' 

I am surprised by this.  This one record has no characters in it, but the âINSERT INTOâ that created it used: ( `os1` ) VALUES ( ââ ) instead of: ( `os1` ) VALUES ( NULL ) .  There are a number of records where `os1` is NULL.  I would like these rows to retrieve as well.  How do I make a WHERE clause for a cell that is NULL ?  

Ron

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