Re: Server just hanging (Copying to tmp table)
Posted by:
Jay Pipes
Date: December 15, 2005 11:18AM
That doesn't make a whole lot of sense. Putting the filter in the ON clause simply means that you trim the joined resultset *before* joining to the primary result. The records that were to be removed by the xno_prod_index.word ='thermometer' filter in the WHERE clause should already be removed by the time the joined results are done...
I'd have to take a look at your schema in order to determine why it didn't work properly. Or, you could post the results of an EXPLAIN SELECT for both variations, and I can probably tell what happened...
Cheers,
Jay Pipes
Community Relations Manager, North America, MySQL Inc.
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