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Message Posted: Wed, 10 Dec 2003 @ 14:25:46 GMT

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Subj:   Re: Concatenating Dates with Times
From:   Dieter Noeth

David Clough wrote:

  I seem to remember someone having an efficient method for combining a Date column and a Time column into a Timestamp column; one that didn't involve Casting to Char and use of '||'.  

     cast(datecol as TimeStamp(2))
        + ((timecol - time '00:00:00') hour to second)

This uses about 5 times less CPU than

        cast(cast(datecol as char(10)) || ' ' ||
             cast(timecol as char(..)) as TimeStamp(2))


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