Subject: ALL() question
From: Julien Cigar <jcigar@ulb.ac.be>
To: pgsql-sql@postgresql.org
Content-Type: text/plain
Date: Wed, 14 Nov 2007 14:39:02 +0100
Message-Id: <1195047542.3190.9.camel@frodon.be-bif.ulb.ac.be>
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Hello,

I have a problem with the ALL() subquery expression.
I have three tables:
- specimens
- test_bits
- specimen_test_bits

The specimen_test_bits table contains two foreign keys, one to
specimens(id), another to test_bits(id). 

Here is an output of specimen_test_bits:

muridae=> select * from specimen_test_bits;
 specimen_id | test_bit_id 
-------------+-------------
       46096 |           1
       46096 |           2
       46096 |           3
       46096 |           4
       52894 |           1
       52894 |           3
       12546 |           2

What I would like is a query that returns all the specimen_id of 
this table which have _all_ the given test_bit_id. So in this
case, with test_bit_id 1,2,3,4 it should return only 
specimen_id 46096.

With the following I got a syntax error:
select specimen_id 
from specimen_test_bits 
where test_bit_id = all(1,2,3,4);

The following works but no rows are returned :
select specimen_id 
from specimen_test_bits 
where test_bit_id = all(select id from test_bits where id in (1,2,3,4));

Any idea how I could do this ? I guess the problem is my ALL() expression ...

In advance thanks,

Julien