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delete duplicates with a null value

Last Modified: 2015-06-16
I have a query that is pretty long - at the end before I do the select I want to delete duplicate serial numbers with no jobtype
how can I do this
Example data
type|SN|qty|job type
TN        87       1       
TN        87       1      surefire
TN        88       1       
TN        88       1      surefire
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