MYSQL, 프로그래머스 정리
MYSQL, TIMESTAMPDIFF
MYSQL, CASE
MYSQL, JOIN, LIKE
MYSQL, JOIN
MYSQL, JOIN, LEFT OUTER JOIN
MYSQL, IS NULL, IFNULL
MYSQL, SET
MYSQL, DATETIME
MYSQL, GROUPBY, HAVING
MYSQL, GROUPBY
MYSQL, DISTINCT
MYSQL