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help / color / mirror / Atom feedFrom: David G Johnston <david.g.johnston@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: Reg: Sql Join
Date: Wed, 30 Jul 2014 15:45:24 -0700 (PDT)
Message-ID: <1406760324275-5813363.post@n5.nabble.com> (raw)
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CrashBandi wrote
> Hi,
>
> I am having the following question. I am not sure how to approach it.
> Please help!
>
> table A
> name col1 col2 col3 col4 apple 100 11111 1 APL orange 200 22222 3 ORG
> carrot 300 33333 3 CRT
>
> table B
> custom_name value obj_type obj_id apple a FR 100 orange o FR 200
> carrot
> c VG 300 apple d FR 11111 orange e VG 22222 carrot f UC 33333 apple h
> VG
> 1 orange o FR 3 carrot c VG 3
> when obj_type ='FR' then join on col1
> When obj_type='VG' then join on col2
> When obj_type='UC' then join on col2
>
> Thanks In advance,
> CB
You cannot do conditional joins in this manner. You will need to write
three joins, one each against a subquery with the appropriate where clause.
David J.
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To: pgsql-sql@postgresql.org
Cc: david.g.johnston@gmail.com
Subject: Re: Reg: Sql Join
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