Uncommon records from two table

HI,

I have two tables.I want to retrieve the uncommon records from two tables.

I m using the queries :

select col1,col2 from table 1
where rtrim(col1+'-'+col2) not in
(select rtrim(col1+'-'+col2) from table 2)

i have used this query also :

select rtrim(col1+'-'+col2+'-'+col3+'-'+col4) from table 1
except
select rtrim(col1+'-'+col2+'-'+col3+'-'+col4) from table 2


The problem is that these two queries are taking huge time for execution.

First table has around 1 lakh records
and the second one is havoin 10.000 records.

Logically,i knw it would take time but is n't there ny another alternative for this ?

thanks

re: Uncommon records from two table

What exactly you mean by uncommon records

re: Uncommon records from two table

Are you talking about this ?

-- CK