Re: Finding missing records

select f1,f2,f3,f4 from table1 EXCEPT ALL select f1,f2,f3,f4 from table2

http://www.postgresql.org/docs/8.1/static/sql-select.html

On 1/27/06, Stefano B. <stefano(dot)bonnin(at)comai(dot)to> 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)
>
> 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