From: | Uwe Schroeder <uwe(at)oss4u(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Subselect AS and Where clause |
Date: | 2011-01-26 07:34:36 |
Message-ID: | 201101252334.37436.uwe@oss4u.com |
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Thread: | |
Lists: | pgsql-general |
Google being useless tonight - now that's new :-)
What I'm trying to do is the following and I'm certain there is a simple
solution which eludes me:
I have a query like this:
SELECT a,b,c, (select problem from other_table where id=a) as problem FROM
mytable WHERE a=1
So far so good. Actually "problem" always resolves to one record, so it's not
the "multiple records returned" problem.
What I try to do is this:
SELECT a,b,c, (select problem from other_table where id=a) as problem FROM
mytable WHERE a=1 and problem = 3
see the "problem=3" part in the where clause? The error I get is
SQLError: (ProgrammingError) column "problem" does not exist
Do I miss something? Shouldn't the "as" assignment make this virtual column
available to the where clause? I think this should work and I know it works if
I'd make a view out of the query. However, the query is built dynamically, so
turning it into a view isn't really an option.
Any pointer will be greatly appreciated.
Uwe
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