Ted Byers <r.ted.byers@xxxxxxxxxx> writes:
> --- Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
>> Why are you asking this list for help with a MySQL
>> performance problem?
>>
> because my question isn't really about MySQL, but
> rather about how best to construct the SQL required to
> get the job done, regardless of what database is used.
> I have seen some claims that it is better to use
> joins instead of correlated subqueries and others that
> say the opposite.
The problem is that the answer may well be different for different
databases. You'd get better answers about MySQL on a MySQL list
than you'll get here.
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
