Обсуждение: How to SELECT

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How to SELECT

От
Angayarkanni
Дата:
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

Re: How to SELECT

От
"A. Kretschmer"
Дата:
In response to Angayarkanni :
> 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

select 'table 1' as table, * from t1 union all select 'table 2', * from t2;


Regards, Andreas
--
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431  2EB0 389D 1DC2 3172 0C99

Re: How to SELECT

От
Dave Crooke
Дата:
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@gmail.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


Re: How to SELECT

От
Angayarkanni
Дата:
Yes I got Yaar

Thanks a lot !!! (Dave Crooke,A. Kretschmer )




Regards,
Angayarkanni Kajendran



On Thu, Mar 11, 2010 at 12:44 PM, A. Kretschmer <andreas.kretschmer@schollglas.com> wrote:
In response to Angayarkanni :
> 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

select 'table 1' as table, * from t1 union all select 'table 2', * from t2;


Regards, Andreas
--
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431  2EB0 389D 1DC2 3172 0C99

--
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