[SQL] How change col name during query to use it in where clause

2012-05-04 Thread Marcel Ruff 

Hi,

is an alias name not usable in the where clause?

select EXTRACT(day from enddate::TIMESTAMP - old_enddate::TIMESTAMP) AS TAGE  from account_h  where 
TAGE>5;

ERROR:  column "tage" does not exist
LINE 1: ... TAGE>5 ...

Thank you
Marcel

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Re: [SQL] How change col name during query to use it in where clause

2012-05-04 Thread Oliveiros d'Azevedo Cristina 

I'm affraid
you can't.


AFAIK,
WHERE clause is processed before the SELECT output expressions

Best,
Oliveiros
- Original Message - 
From: "Marcel Ruff" 

To: 
Sent: Friday, May 04, 2012 11:25 AM
Subject: [SQL] How change col name during query to use it in where clause



Hi,

is an alias name not usable in the where clause?

select EXTRACT(day from enddate::TIMESTAMP - old_enddate::TIMESTAMP) AS 
TAGE  from account_h  where TAGE>5;

ERROR:  column "tage" does not exist
LINE 1: ... TAGE>5 ...

Thank you
Marcel

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Re: [SQL] How change col name during query to use it in where clause

2012-05-04 Thread Andreas Kretschmer 



Marcel Ruff  hat am 4. Mai 2012 um 12:25 geschrieben:

> Hi,
>
> is an alias name not usable in the where clause?

Exactly.

Andreas

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Re: [SQL] How change col name during query to use it in where clause

2012-05-04 Thread Thomas Kellerer 

Marcel Ruff, 04.05.2012 12:25:

Hi,

is an alias name not usable in the where clause?

select EXTRACT(day from enddate::TIMESTAMP - old_enddate::TIMESTAMP) AS TAGE from 
account_h where TAGE>5;
ERROR: column "tage" does not exist
LINE 1: ... TAGE>5 ...


You need to wrap the query:

select *
from (
   select EXTRACT(day from enddate::TIMESTAMP - old_enddate::TIMESTAMP) AS TAGE
   from account_h
) t
where TAGE > 5;




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