Search for "OMG" In J.M. article:
http://www.sqlservercentral.com/articles/T-SQL/68467/
It does explain the problem in details and gives good example.
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"The only true wisdom is in knowing you know nothing"
"O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
(So many miracle inventions provided by MS to us...)
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