WITH A ( aa ,bb, cc ) AS (
SELECT '1','가','100' FROM DUAL UNION ALL
SELECT '2','가','200' FROM DUAL UNION ALL
SELECT '3','나','300' FROM DUAL 
) , B ( a , b ) AS (
SELECT '가','200' FROM DUAL 
)

/*-- NOT IN
SELECT * FROM A 
WHERE (bb,cc) NOT IN ( SELECT a , b FROM B )*/

/*-- NOT EXISTS
SELECT * FROM A 
WHERE NOT EXISTS ( SELECT NULL FROM B WHERE B.a = A.bb AND B.b = A.cc )*/

/*-- MINUS
SELECT bb , cc FROM A 
MINUS
SELECT a , b FROM B */