Help needed with comparing two tables

Question

Hi
I have two tables which have same column names but different entries in each one of them and some common entries between the two tables.
Table A has all the entries of Table B and some extra ones.. and I need SQL to give me those extra ones that are not in Table B
Table A columns names (col1, col2 col3 ...) and data
col1 col2 col3 col4 col5 col6
a1 a2 a3 a4 a5 a6
b1 b2 b3 b4 b5 b6
c1 c2 c3 c4 c5 c6
d1 d2 d3 d4 d5 d6
All columns are varchar2
Table B columns names ( col1,col2 ..) and data
col1 col2 col3 col4 col5 col6
a1 a2 a3 a4 a5 a6
c1 c2 c3 c4 c5 c6
All columns are varchar2
So the answer I would like to get is
b1 b2 b3 b4 b5 b6
d1 d2 d3 d4 d5 d6
because these two entries are not in Table B but in Table A
Appreciate if you can help me with this because I have millions of records that I need sort through and get the entries and cannot be done manually..
Thanks in Advance
Kris

Answer 1

Here is an example:
SELECT 'X' FROM DUAL UNION SELECT 'Y' FROM DUAL
MINUS
SELECT 'X' FROM DUAL;
Y