Mysql Ver 4.1 에서 추가된 기능
1. 서브 쿼리 ex) SELECT * FROM t1 WHERE column1 = (SELECT column1 FROM t2); 2. ON DUPLICATE KEY UPDATE 문 ex) INSERT INTO table (a,b,c) VALUES (4,5,6) ON DUPLICATE KEY UPDATE c=9; 3. group by 구문에서 GROUP_CONCAT GROUP_CONCAT([DISTINCT] expr [,expr ...] [ORDER BY {unsigned_integer | col_name | expr} [ASC | DESC] [,col_name ...]] [SEPARATOR str_val]) ex) SELECT student_name, GROUP_CONCAT(DISTINCT test_sc..