Re: SQL syntax appears correct but EXPLAIN does not work?
Yes, using a UNION makes perfect sense, except that I had modified the original UPDATE so I could use EXPLAIN. In the context of the UPDATE I cannot use the UNION because because the sub-select would contain the table being updated. See the first message in this thread for my original query.
Look slike I will have to use a temp table again.
Does your book cover the way the optimiser works Jay? If it does I cannot wait until it is on the shelves!
Regards,
David
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Re: SQL syntax appears correct but EXPLAIN does not work?
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