表:-- Create table
create table LOCATION
(
  LOC            NVARCHAR2(15) not null,
  DESCRIPTION    NVARCHAR2(40),
  USERID         NVARCHAR2(20),
  CREATEBY       VARCHAR2(30),
  CREATETIME     DATE,
  MODIFYBY       VARCHAR2(30),
  LASTMODIFYTIME DATE,
  STOREAREA_CODE VARCHAR2(4),
  STOREKEEPER    VARCHAR2(20)
)

一。查找重复记录
1。查找全部重复记录

Select * From location l Where l.storekeeper In (Select l.storekeeper From location Group By l.storekeeper Having Count(*)>1)
2。过滤重复记录(只显示一条)

Select * From location l Where rowid In (Select Max(rowid) From location l Group By l.storekeeper)

二。删除重复记录
 1。删除全部重复记录（慎用）
Delete location l Where l.storekeeper In (Select l.storekeeper From location l Group By l.storekeeper Having Count(*)>1)

2。保留一条
Delete location Where rownum Not In (Select Max(rownum) From location l Group By l.storekeeper)