SQL portability can be a real red herring, given the variations found across
the range of implementations. You have to ask yourself how many different
flavors of SQL you want to try to support. You may have no choice but to have
slightly different code bases for each flavor.
I don't know if there is a portable way for getting "today's date". Oracle
uses "sysdate"; Informix uses "current...". MSSQL and Sybase may actually
use the same function, given their common heritage.
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