after the table alias you can rename your cloumns in join:
> select <some field>, coalesce(TRR.ABC, SOC.ABC) as newABC, ...
> from A join (B join C on (..)) on (..))
as TRR(<new column names>) <-- here
> left join
> (D join E on (..)) as SOC on (TRR.Field1=SOC.Field2)
----- Original Message -----
From: "Linh Luong" <linh.luong@computalog.com>
To: <pgsql-general@postgresql.org>
Sent: 2001. május 24. 21:58
Subject: [GENERAL] Column name
> Hi,
>
> I am trying to do a 2 joins between 3 tables.
>
> ie)
> select <some field>, coalesce(TRR.ABC, SOC.ABC) as newABC, ...
> from A join (B join C on (..)) on (..)) as TRR
> left join
> (D join E on (..)) as SOC on (TRR.Field1=SOC.Field2)
>
> When I run this it says that there is an ambiguous field. Yes after the
> join for TRR and SOC they both contain a fields name ABC. How can I
> rename this field in the sql statement or how can I make it so the sql
> statement know that they are different.
>
> Please help.. .thanks
>
> --
> Linh Luong
> Computalog Ltd.
> Software Developer
> Phone: (780) 464-6686 (ext 325)
> Email: linh.luong@computalog.com
>
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