Re: Strange Join question

Can you do
select table2.f1, table1.name
from table1,table2
where table1.id =
table 2.id and table2.id = 2
GROUP BY table2.f1, table1.name;


Patrick Hatcher
Macys.Com
Legacy Integration Developer
415-422-1610 office
HatcherPT - AIM





         
                    Noah Silverman
         
                    <noah@allresearch.com>             To:     pgsql-performance@postgresql.org
         
                    Sent by:                           cc:
         
                    pgsql-performance-owner@post       Subject:     [PERFORM] Strange Join question
         
                    gresql.org
         

         

         
                    01/17/2003 09:28 AM
         

         

         




Hi,

I have a challenging (for me) SQL question:

Two tables
(Note: these are fictitious, the real tables actually make sense, so no
need to re-design our table structure)

Table 1
id | name | count
------------------------
1 |   foo    |  10
1 |   foo    |  20
2 |  bar     |  100


Table 2
id  | f1  | f2  | t1ref
-----------------------
1  | 10  |  20 | 1
2  | 50  | 40  | 2


The question:

I want to do the following select:
select table2.f1, table1.name   from table1,table2 where table1.id =
table 2.id and table2.id = 2;

The problem is that I really only need the name from table2 returned
once.  With this query, I get two records back.  Clearly this is
because of the join that I am doing.  Is there a different way to
perform this join, so that I only get back ONE record from table1 that
matches?

Thanks,

-Noah


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