https://medium.com/@su_bak/mysql%EC%9D%98-sql-mode%EC%99%80-%EA%B8%B0%EB%B3%B8-sql-mode%EB%93%A4%EC%9D%B4-%ED%95%98%EB%8A%94-%EC%97%AD%ED%95%A0-b01c09d84cdc
