表A:
编号 时间 产品名 价格 数量
1 2010-05-01 CKJ 10 1
1 2010-05-01 CKU 20 1
2 2010-05-03 CKJ 30 1
3 2010-05-01 CKJ 40 1
4 2010-05-01 CKJ 50 1
表2
编号 时间 产品名
1 2010-05-01 CKJ
2 2010-05-03 CKJ
3 2010-05-12 CKJ
4 2010-05-10 CKJ
我如何删除表A中和表B编号,时间和产品名都一样的数据
结果
编号 时间 产品名 价格 数量
1 2010-05-01 CKU 20 1
3 2010-05-01 CKJ 40 1
4 2010-05-01 CKJ 50 1
谢谢~~~~~
编号 时间 产品名 价格 数量
1 2010-05-01 CKJ 10 1
1 2010-05-01 CKU 20 1
2 2010-05-03 CKJ 30 1
3 2010-05-01 CKJ 40 1
4 2010-05-01 CKJ 50 1
表2
编号 时间 产品名
1 2010-05-01 CKJ
2 2010-05-03 CKJ
3 2010-05-12 CKJ
4 2010-05-10 CKJ
我如何删除表A中和表B编号,时间和产品名都一样的数据
结果
编号 时间 产品名 价格 数量
1 2010-05-01 CKU 20 1
3 2010-05-01 CKJ 40 1
4 2010-05-01 CKJ 50 1
谢谢~~~~~
--> --> (Roy)生成測試數據if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go--I、Name相同ID最小的记录(推荐用1,2,3),保留最小一条
方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID<a.ID)方法2:
delete a from #T a left join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null方法3:
delete a from #T a where ID not in (select min(ID) from #T where Name=a.Name)方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select min(ID)from #T group by Name)方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID<a.ID)>0方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID)方法7:
delete a from #T a where ID>any(select ID from #T where Name=a.Name)select * from #T生成结果:
/*
ID Name Memo
----------- ---- ----
1 A A1
4 B B1(2 行受影响)
*/
--II、Name相同ID保留最大的一条记录:方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID>a.ID)方法2:
delete a from #T a left join (select max(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null方法3:
delete a from #T a where ID not in (select max(ID) from #T where Name=a.Name)方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select max(ID)from #T group by Name)方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID>a.ID)>0方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID desc)方法7:
delete a from #T a where ID<any(select ID from #T where Name=a.Name)
select * from #T
/*
ID Name Memo
----------- ---- ----
3 A A3
5 B B2(2 行受影响)
*/--3、删除重复记录没有大小关系时,处理重复值
--> --> (Roy)生成測試數據
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([Num] int,[Name] nvarchar(1))
Insert #T
select 1,N'A' union all
select 1,N'A' union all
select 1,N'A' union all
select 2,N'B' union all
select 2,N'B'
Go方法1:
if object_id('Tempdb..#') is not null
drop table #
Select distinct * into # from #T--排除重复记录结果集生成临时表#truncate table #T--清空表insert #T select * from # --把临时表#插入到表#T中--查看结果
select * from #T/*
Num Name
----------- ----
1 A
2 B(2 行受影响)
*/
(
idno int,
dates datetime,
names nvarchar(50),
moneys int,
num int
)
insert into #t1
select 1,'2010-05-01', 'CKJ', 10 ,1 union all
select 1,'2010-05-01', 'CKU', 20 ,1 union all
select 2,'2010-05-03', 'CKJ', 30 ,1 union all
select 3,'2010-05-01', 'CKJ', 40 ,1 union all
select 4,'2010-05-01', 'CKJ', 50 ,1
create table #t2
(
idno int,
dates datetime,
names nvarchar(50)
)
insert into #t2
select 1,'2010-05-01', 'CKJ' union all
select 2,'2010-05-03', 'CKJ' union all
select 3,'2010-05-12', 'CKJ' union all
select 4,'2010-05-10', 'CKJ'
delete #t1 from #t1
left join #t2 on #t1.dates=#t2.dates and #t1.idno=#t2.idno and #t1.names=#t2.names
where #t1.dates=#t2.dates and #t1.idno=#t2.idno and #t1.names=#t2.names
FROM TBA A
INNER JOIN TBB B ON A.[时间] = B.[时间] AND A.[产品名] =B.[产品名] AND A.编号 = B.编号/*
编号 时间 产品名 价格 数量
1 2010-05-01 00:00:00.000 CKU 20 1
3 2010-05-01 00:00:00.000 CKJ 40 1
4 2010-05-01 00:00:00.000 CKJ 50 1*/
where exists(select 1 from B where 编号=a.编号 AND 时间=A.时间 AND 产品名=A.产品名)
insert into a values(1 ,'2010-05-01', 'CKJ', 10, 1)
insert into a values(1 ,'2010-05-01', 'CKU', 20, 1)
insert into a values(2 ,'2010-05-03', 'CKJ', 30, 1)
insert into a values(3 ,'2010-05-01', 'CKJ', 40, 1)
insert into a values(4 ,'2010-05-01', 'CKJ', 50, 1)
godelete a from a t where 产品名 not in (select min(产品名) from a where 编号 = t.编号 and 时间 = t.时间)select * from adrop table A/*
编号 时间 产品名 价格 数量
----------- ------------------------------------------------------ ---------- ----------- -----------
1 2010-05-01 00:00:00.000 CKJ 10 1
2 2010-05-03 00:00:00.000 CKJ 30 1
3 2010-05-01 00:00:00.000 CKJ 40 1
4 2010-05-01 00:00:00.000 CKJ 50 1(所影响的行数为 4 行)
*/
insert into tab1 values(1,'2010-05-01','CKJ',10,1)
insert into tab1 values(1,'2010-05-01','CKU',20,1)
insert into tab1 values(2,'2010-05-03','CKJ',30,1)
insert into tab1 values(3,'2010-05-01','CKJ',40,1)
insert into tab1 values(4,'2010-05-01','CKJ',50,1)delete from tab1CREATE table tab2(Number int,time datetime,Name varchar(20))
insert into tab2 values(1,'2010-05-01','CKJ')
insert into tab2 values(2,'2010-05-03','CKJ')
insert into tab2 values(3,'2010-05-12','CKJ')
insert into tab2 values(4,'2010-05-10','CKJ')delete tab1 from tab1 a left join tab2 b on a.Number = b.Number
and a.Name = b.Name and a.Time = b.Time where b.Number is NOT NULLselect * from tab1
delete 表A a from 表B b where a.id=b.id and a.时间=b.时间 and a.产品名=b.产品名
delete 表A a from