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How to find the different values between 2 tables

Prashant

I have 2 tables and I want to find only the different values in 2 columns on one of the tables (only the unique combination of 2 strings that is not in the first table )

for example : TABEL 1

ID1 ID2 X1 X2 X3 X4 X5 X6 X3 X4 X6 X7

TABEL 2 (the table I want to take the values from that are not in table1 )

ID1 ID2 X1 X2 X3 X4 X5 X6 X4 X3 X1 X9 X3 X12

the output will be :

ID1 ID2 X1 X9 X3 X12