UPDATE t_plm_contract_bill_term_monitor set is_deleted=1, gmt_modify=now()
where id in(
	select id from (
		select min(id) as id from t_plm_contract_bill_term_monitor
		where is_deleted=0
		and bill_term_start_date = '2020-02-01'
		group by bill_term_start_date,contract_id
		having count(*)>1) as tmp )
;