How to SELECT - Mailing list pgsql-performance

From Angayarkanni
Subject How to SELECT
Date
Msg-id 2a77004c1003102256l24af41e5ueab35874f5320ffa@mail.gmail.com
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Responses Re: How to SELECT
Re: How to SELECT
List pgsql-performance
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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