mysqlhttps://mizykk.tistory.com/121https://dev.mysql.com/doc/refman/8.0/en/window-functions-usage.htmlredshifthttps://docs.aws.amazon.com/ko_kr/redshift/latest/dg/c_Window_functions.htmlpostgrehttps://www.postgresql.org/docs/current/tutorial-window.html
