MySQL里获取当前week,month,quarter 的 start_date/end_date
当前week的第一天: selectdate_sub(curdate(),INTERVALWEEKDAY(curdate())+1DAY) 当前week的最后一天: selectdate_sub(curdate(),INTERVALWEEKDAY(curdate())-5DAY) 前一week的第一天: selectdate_sub(curdate(),INTERVALWEEKDAY(curdat