Matching one column value to part of another in SQL

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This seems fairly straightforward:

select GLAccountID
     , GLAccountDesc
  from daTable
 where GLAccountID <> 
       substring(GLAccountDesc from 1 for 4)

Presumably it isn't quite so obvious if you have never used the SUBSTRING function in a comparison before.

To me, a more interesting solution is this one:

update daTable
   set GLAccountDesc = 
       substring(GLAccountDesc from 5)

Much more satisfying, don't you think? <wink>