I enable warnings and thus I get: 
Argument "mssql" isn't numeric in numeric eq (==) at test.pl line 3.
Argument "mssql" isn't numeric in numeric eq (==) at test.pl line 3.
equal
Argument "mssql" isn't numeric in numeric eq (==) at test.pl line 5.
Argument "MSSQL" isn't numeric in numeric eq (==) at test.pl line 5.
equal

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Enough clues, already?

In reply to Re^2: is behaviour undefined for string comparision with == by bart
in thread is behaviour undefined for string comparision with == by edwardt_tril

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