From: | Dave Crooke <dcrooke(at)gmail(dot)com> |
---|---|
To: | Angayarkanni <kangayarkanni(at)gmail(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: How to SELECT |
Date: | 2010-03-11 07:15:10 |
Message-ID: | ca24673e1003102315g699fc0d0sbd3feac4545a6b37@mail.gmail.com |
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Lists: | pgsql-performance |
Hi there
This list is for performance tuning questions related to PostgreSQL ... your
question is a general SQL syntax issue. Also, it's not quite clear from your
message exactly what you are trying to do - it's better to post example
table schemas.
At a guess, I think you might want:
select 1, * from T1
union all
select 2, * from T2
Cheers
Dave
On Thu, Mar 11, 2010 at 12:56 AM, Angayarkanni <kangayarkanni(at)gmail(dot)com>wrote:
> Hi,
>
> I am the beginner of pgpsql
>
>
> I need to select from two tables say T1,T2 by UNION
>
> when the value is from T1 the output should by a 1 and
> when the value from T2 the out put should be 2
>
> when T1 Hits values should be 1 and when T2 hits the value should be 2
>
>
> or when we use
> COALESCE(is exits value, or this value)
>
> i need
> say_some_function (if value display,1)
>
> results should be as
> 1
> 1
> 2
> 2
> 1
> 1
>
> Is it possible Can any one help me...
>
> Thanks & Regards
> AK
>
>
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