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Re: querying from 3 tables

From: "Christopher Kings-Lynne" <chriskl(at)familyhealth(dot)com(dot)au>
To: "ryanne cruz" <ryanne(dot)cruz(at)up(dot)edu(dot)ph>, <pgsql-php(at)postgresql(dot)org>
Subject: Re: querying from 3 tables
Date: 2003-03-07 05:30:49
Message-ID: 02c901c2e46a$b6841150$6500a8c0@fhp.internal (view raw or flat)
Thread:
Lists: pgsql-php
> i am given the esourceid and i need to query the brgyid and the households
of
> a particular esourceid: query1="select brgyid, households from table1
where
> esourceid=$esourceid;"
>
> the resulting brgyid will then be used to query for the munprovid in
table2:
> query2="select munprovid from table2 where brgyid=(query1);"
>
> the resulting munprovid will then be used to query for  the geom column:
> "select geom from table3 where munprovid=(query2);"
>
> my question is, how do i do this? any ideas?

You can do this:

select geom from table3 where munprovid=(select munprovid from table2 where
brgyid=(select brgyid, households from table1 where esourceid=$esourceid));

Chris


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