How to SELECT

From: Angayarkanni <kangayarkanni(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: How to SELECT
Date: 2010-03-11 06:56:02
Message-ID: 2a77004c1003102256l24af41e5ueab35874f5320ffa@mail.gmail.com
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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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