sql查询重复数据

select * from t_contract_purchase t where t.purcontractid  in (select purcontractid from t_contract_purchase
  group by purcontractid having count(1)>1) and t.subcompanyid='****' order by t.purcontractid desc, t.purcharseid desc;

查询表t_contract_purchase中，所有purcontractid字段内容重复的数据，并把数据按照先按照purcontractid，再按照purcharseid 降序排列展示出来。

更加精简一点，可以将语句改成：

select * from t_contract_purchase t where (select count(*) from t_contract_purchase s where s.purcontractid=t.purcontractid)>1