Richard,

> I think this is the "adding a table into the FROM" feature of PG. You're 
> referring to documents.xxx in the select and d.id in the FROM. PG tries to 
> help out by adding the table into the FROM for you - hence cartesian join.

Aha!  You're right.

> I think you can turn this "feature" off in the config file in 7.3.x (haven't 
> checked this though)

Nope, it's a 7.4 feature to turn it off in .conf.  Look under the 
"compatibility" section (the last section) in 7.4's postgresql.conf.

-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco


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