From: Dan Nelson
Date: June 5 2002 5:48pm
Subject: Re: Maximum JOINED tables
List-Archive: http://lists.mysql.com/mysql/111091
Message-Id: <20020605174843.GH11978@dan.emsphone.com>
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In the last episode (Jun 05), Sabine Richter said:
> "Weaver, Walt" wrote:
> > From: Roger Baklund [mailto:roger.baklund@stripped]
> > * Arthur Fuller
> > > I have searched the manual without success. I want to know the
> > > maximum number of tables MySQL permits to be JOINed in a single
> > > SELECT statement.
> > 
> > According to crashme, it is 32 in 3.22.39 and 63 in 3.23.39.
> > 
> > Hmmm... we're running 3.23.47 here and have run into a 32 table
> > join limit...
>
> And how long does it take to compile a 32-tables-statement? With the
> gupta server a 14-tables-statement took 2 hours.

That all depends on how complex your query is and the size of the
tables.  A query that takes 2 hours to run probably can be optimized a
lot, though.

-- 
	Dan Nelson
	dnelson@stripped