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-- 回推月數 set @No=6; -- 起始日期 set @MyDate='2021-04-10'; select date_sub(date_sub(date_format(@MyDate,'%y-%m-%d'),interval extract( day from @MyDate)-1 day),interval @No month) as month_first, date_sub(date_sub(date_format(@MyDate,'%y-%m-%d'),interval extract( day from @MyDate) day),interval @No-1 month) as month_last
month_first
month_last
2020-10-01
2020-10-31