From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
---|---|
To: | "Stefano B(dot)" <stefano(dot)bonnin(at)comai(dot)to> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Finding missing records |
Date: | 2006-01-27 17:23:57 |
Message-ID: | 20060127092307.X26847@megazone.bigpanda.com |
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Thread: | |
Lists: | pgsql-general |
On Fri, 27 Jan 2006, Stefano B. wrote:
> Hi,
>
> I have two identical tables
>
> table1 (f1,f2,f3,f4 primary key (f1,f2,f3,f4))
> table2 (g1,g2,g3,g4 primary key (g1,g2,g3,g4))
>
> How can I find the difference between the two tables?
> table1 has 10000 records
> table2 has 9900 records (these records are in table1 as well)
>
> I'd like to find 100 missing records.
> I have try this query
>
> select f1,f2,f3,f4 from table1 where (f1,f2,f3,f4) NOT IN (select f1,f2,f3,f4 from table2)
Is there a reason you've used f1-f4 in the table2 subselect rather than
g1-g4? From the definitions above, I think the f1-f4 in the subselect are
becoming outer references which isn't what you want.
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