If to you NULL = '' then declare you column NOT NULL !! (maybe even add "with default '' )
there are some nice article regarding NULL and its impact for mistakes .... to happen ....
-http://www.sqlservercentral.com/articles/Advanced+Querying/2829/
- http://www.sqlservercentral.com/articles/T-SQL/understandingthedifferencebetweenisnull/871/
- http://www.sqlservercentral.com/articles/ANSI_NULLs/69234/
- http://www.sqlservercentral.com/articles/Advanced+Querying/gotchasqlaggregatefunctionsandnull/1947/
- http://www.sqlservercentral.com/articles/Advanced/2921/
Johan
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