Robert Cummings wrote:
On Thu, 2007-10-04 at 11:23 +1000, Chris wrote:
Robert Cummings wrote:
On Wed, 2007-10-03 at 14:49 -0700, Jim Lucas wrote:
This is only from my own personal testing. Mind you that I have only been using PostgreSQL for a
year or so. But one problem that I have always ran into with MySQL is that when JOIN'ing tables
that have large data sets is a PITA.
Were you doing left joins when you experienced those problems? Left
joins are usually very fast.
If indexed properly of course ;)
Yes, but you're not going to get a performance improvement if you use
anything else if the table isn't properly indexed.
A subselect could win out in terms of performance especially if the
table in the subselect is reasonably small (eg all fits into memory).
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