; Sub Query의 결과를 비교 조건으로 사용하고 싶을 때 이용
1) ALL
SELECT menu FROM tbl_menu1 WHERE price > ALL
(SELECT price FROM tbl_menu1 WHERE menu LIKE '%닭%');
2) EXISTS, NOT EXISTS
SELECT * FROM tbl_menber WHERE EXISTS
(SELECT name FROM tbl_member WHERE no = 5);
SELECT * FROM tbl_menber WHERE NOT EXISTS
(SELECT name FROM tbl_member WHERE no = 5);
3) ANY
SELECT name, price FROM tbl_stock WHERE price = ANY (SELECT price FROM tbl_stock WHERE country LIKE 'america');