Posted by Erland Sommarskog on 12/04/07 22:29

kishjeff (kishjjrjj@charter.net) writes:
> I guess that is the 'key', i.e. the character has to be absolutely not
> in the data or it has the potential (small but real) to fail, right?

The key is that it is a completely unnecessary kludge, when there exists
a perfectly normal solution with NOT EXISTS.

Not that this kludge also prevents efficient use of indexes.

There are cases when concatenating stuff can be a useful trick, but this
is not one of them.


--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
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