ORACLE,SQLSERVER,DB2 删除重复数据SQL

CREATE TABLE TUser(
Name varchar(50),
Region varchar(50),
Remark varchar(100)
)

INSERT into TUser VALUES ('Tom','Franc', 'test1')
INSERT into TUser VALUES ('Tom','Japan', 'test3')
INSERT into TUser VALUES ('Mary','Japan', 'test4')
INSERT into TUser VALUES ('Tom','German', 'test5')

DELETE FROM (SELECT ROW_NUMBER() OVER (partition  BY name ORDER BY name) AS RN
FROM TUSER) AS E  where RN>1

WITH [CTE_DUPLICATE] AS
(SELECT ROW_NUMBER() OVER (partition  BY name ORDER BY name) AS RN FROM TUser
)
delete from  [CTE_DUPLICATE] where RN>1

DELETE from TUser where C_STP_CODE IN
(SELECT NAME FROM TUser GROUP BY NAME HAVING COUNT(NAME)>1)
AND ROWID NOT
IN (SELECT MIN(ROWID) FROM TUser GROUP BY NAME HAVING COUNT(NAME) >1);