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

SELECT field1 FROM table1 WHERE field1 NOT IN (SELECT field2 FROM table2)

Will work so long as field2 can't contain NULLs.