Re: Select for LEFT JOIN

>>>>> "LL" == Linh Luong <linh(dot)luong(at)computalog(dot)com> writes:

LL> Hi,
LL> I am trying to do a 2 joins between 3 tables.

LL> ie)
LL> select <some field>, coalesce(TRR.ABC, SOC.ABC) as newABC, ...
LL> from A join (B join C on (..)) on (..)) as TRR
LL> left join
LL> (D join E on (..)) as SOC on (TRR.Field1=SOC.Field2)

LL> When I run this it says that there is an ambiguous field. Yes after the
LL> join for TRR and SOC they both contain a fields name ABC. How can I
LL> rename this field in the sql statement or how can I make it so the sql
LL> statement know that they are different.

LL> Please help.. .thanks

You have to use full-qualifyed field names, like this:

select trr.abc, soc.abc,....

In addition you can use aliases for field names:

select trr.abc as abc1, soc.abc as abc2, ....

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Anatoly K. Lasareff Email: tolik(at)aaanet(dot)ru
http://tolikus.hq.aaanet.ru:8080