sql에 두 개의 varchar를 곱하다 시도했지만 오류가 발생했습니다. MariaDB [test]> create table table1 (length varchar, breadth varchar); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ' breadth varchar)' at line 1 MariaDB [test]> create table table1 (length varchar(20), breadth varchar(20)); Query OK, 0 rows affe..