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select stateID,stepID from pro1 where code=217 group by stateid,stepID order by stateid,stepID desc
查出来的结果是order by stateID desc,stepID dese
select stateID,stepID from pro1 where code=217
group by stateid,stepID
order by stateid desc
,stepID
select stateID,stepID from pro1 where code=217 group by stateid,stepID order by stateid desc,stepID desc
order by stateID desc,stepID