in reply to Re: undef and empty variables
in thread undef and empty variables


Depending on the RDBMS, the empty string may not be distinguished from NULL. Oracle leaps instantly to mind as one which explicitly documents their equivalence between an empty string and NULL. That's not standards compliant, but it's Oracle.


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Re^3: undef and empty variables
by tilly (Archbishop) on Jan 19, 2011 at 18:03 UTC
    That is one of the reasons that I said "think carefully about your data" instead of "null and empty string ar different".