Cast 기본 형식 SELECT CAST(10 / 2 AS SIGNED); # 5 SELECT 10 / '2', 10 / 2, 10 / CAST('2' AS UNSIGNED); /* 5 5.0000 5.0000 */ 사용 가능한 타입 BINARY CHAR DATE DATETIME TIME DECIMAL JSON NCHAR SIGNED (INTEGER) UNSIGNED (INTEGER)