1、對於第一種重複,比較容易解決,使用
select distinct * from tableName
就可以得到無重複記錄的結果集。
如果該表需要刪除重複的記錄(重複記錄保留1條),可以按以下方法刪除
select distinct * into #Tmp from tableName
drop table tableName
select * into tableName from #Tmp
drop table #Tmp
發生這種重複的原因是表設計不周產生的,增加唯一索引列即可解決。
假設有重複的字段爲Name,Address,要求得到這兩個字段唯一的結果集
select identity(int,1,1) as autoID, * into #Tmp from tableName
select min(autoID) as autoID into #Tmp2 from #Tmp group by Name,autoID
select * from #Tmp where autoID in(select autoID from #tmp2)
最後一個select即得到了Name,Address不重複的結果集(但多了一個autoID字段,實際寫時可以寫在select子句中省去此列)
delete from table where id not in ( select min(id) from table group by name)
declare cur_rows cursor local for select 主字段,count(*) from 表名 group by 主字段 having count(*) > 1
open cur_rows
fetch cur_rows into @id,@max
while @@fetch_status=0
begin
select @max = @max -1
set rowcount @max
delete from 表名 where 主字段 = @id
fetch cur_rows into @id,@max
end
close cur_rows
set rowcount 0
得出的辦法:
select * from user1 where [id] not in (select top 1 [id] from user1 a where name=user1.name)
--刪就這樣寫
delete from user1 where [id] not in (select top 1 [id] from user1 a where name=user1.name)
或 delete from user where id not in ( select max(id) from user where name=user.name)
delete [user] where id not in (select max(id) from [user] group by name having count(*) > 1)
max 或 min看具體情況而論。
其他方法:
----A:保留id最大的行,刪除其它行
--方法1
delete [user] from [user] t
inner join(select name,max(id) as id from [user] group by name) a
on t.name = a.name and t.id <> a.id
--方法2
delete [user] from [user] t
where exists(select * from [user] where name = t.name and id > t.id)
----B:保留id最小的行,刪除其它行
--方法1
delete [user] from [user] t
inner join(select name,min(id) as id from [user] group by name) a
on t.name = a.name and t.id <> a.id
--方法2
delete [user] from [user] t
where exists(select * from [user] where name = t.name and id < t.id)
----C:刪除所有重複的name行,一行也不留
delete [user] from [user] t
inner join
(select id from [user] a where exists(select * from [user] where name = a.name group by name having count(*) > 1)) as b
on t.id = b.id
--摘自網絡