[mysql|mariadb] 문자열 합치는 함수 (feat. concat, concat_ws, group_concat)
concat 문자열 합치기 https://mariadb.com/kb/en/concat/ CONCAT Returns concatenated string. mariadb.com syntax CONCAT(str1,str2,...) example SELECT CONCAT('Ma', 'ria', 'DB'); +---------------------------+ | CONCAT('Ma', 'ria', 'DB') | +---------------------------+ | MariaDB | +---------------------------+ SELECT CONCAT('Ma', 'ria', NULL, 'DB'); +---------------------------------+ | CONCAT('Ma', 'ria', ..