Finding missing records

From: "Stefano B(dot)" <stefano(dot)bonnin(at)comai(dot)to>
To: <pgsql-general(at)postgresql(dot)org>
Subject: Finding missing records
Date: 2006-01-27 13:59:47
Message-ID: 004801c62349$eebf5860$0501a8c0@comai04
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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)

but it seems not work (as I want). It returns me no records. If I use the IN clause it returns me all 10000 table1 records.

Thanks in advance
Stefano

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