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Re: Odd error in complex query (7.2): Sub-SELECT

From: Philip Warner <pjw(at)rhyme(dot)com(dot)au>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Odd error in complex query (7.2): Sub-SELECT
Date: 2001-10-30 03:35:43
Message-ID: 3.0.5.32.20011030143543.02b09870@mail.rhyme.com.au (view raw or flat)
Thread:
Lists: pgsql-hackers
At 14:36 29/10/01 -0500, Tom Lane wrote:
>Philip Warner <pjw(at)rhyme(dot)com(dot)au> writes:
>> Sorry for the convoluted example:
>
>A simplified example is 

And here's a simpler one that seems to avoid views altogether:

    create table lkp(f1 int);
    create table t1(f1 int, x int);

    Select
         case when Exists(Select * From lkp where lkp.f1 = t1.f1) then
             'known'
         else
             'unknown'
         end as status, 
         sum(x)
    from t1
    group by 1;

It's pretty similar to the sample you gave, but also presents the sort of
operation people may well want to perform.    


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