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

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;