sql語句 查重複的紀錄

--建立測試環境
create table ttt
(
  name varchar(20),
  addr varchar(20)
)
insert ttt
select '張三','中國北京市' union all
select '李四','中國上海市' union all
select '王五','中國天津市' union all
select '張三','中國四川省'

方法一:
select * from ttt t
where exists(select 1 from ttt where name=t.name and addr<>t.addr)
方法二:
declare @tb table(ID int identity,name varchar(20),addr varchar(20))
insert @tb(name,addr) select * from ttt
select name,addr from @tb t
where exists(select 1 from @tb where name=t.name and ID<>t.ID)
方法三:
select * from ttt t
where
     (select count(1) from ttt where name=t.name)>1
order by name
方法四:
select * from ttt t
 where exists  (select top b.name  from (select top 2 t1.name from ttt t1
where name=t1.name order by t1.name) b
where b.name = t.name)
order by name