Prevent Oracle minus statement from removing duplicates

Question

Given these two tables:

CREATE TABLE TEST1 (TEST  VARCHAR2(1 BYTE))
CREATE TABLE TEST2 (TEST  VARCHAR2(1 BYTE))

Where TEST1 has two rows both w

Answer 1

Oracle supports multiple columns in the IN statement, so you can write:

SELECT a, b, c
FROM table1
WHERE (a,b,c) not in (
    select a,b,c from table2
)