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Using substring to remove characters

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Last Modified: 2012-05-12
I am currently using the following to strip away any characters in a field that precede a ",", however, this code returns the entire field if there is no comma...For instance if the field
had jones,BA I want to return just BA. IF the field just contained Jones than Jones would be returned. I want null or empty to be returned

substring(lastname,charindex(',',lastname)+1,len(lastname)) as LASTNAME,lastname

Thanks....
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