select distinct A.uuid from onecard_parking_cardhistory as A left join onecard_parking_bill as B
on A.uuid=B.uuid order by outgoingtime desc incoming
select * from A
left join B on B.uuid=A.uuid
order by outgoingtime desc,incoming
想法不全,空的outgoingtime在前还是在后?没要求就直接order by outgoingtime desc,incoming