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  3. January 2006

RE: SQL UPDATE using INNER JOIN?

Empirically speaking, EXISTS runs much faster on the iSeries.  I don't know
why exactly.  I can only speculate that it's due to some early-exit scheme
in the db code.

-----Original Message-----
 Subject: Re: SQL UPDATE using INNER JOIN?

Is there any difference/advantage to using the EXISTS vs the IN clause? This
is the way I'm currently trying to do it. However, The whole reason for
researching the INNER JOIN was due to this taking a really long time to run.
When the IN clause is used it would appear to be re-querying the table for
every record. You can imagine the overhead and time involved if there are
several hundred thousand records.

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