set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER proc [dbo].[StdRelDocAndApp_DelStdRelDoc2]
(
@StdOrgId varchar(8),
@completer varchar(8)
)
as
delete from StdRelDoc where StdRelDoc.StdID in(select Std.ID from Std where StdOrgId=@StdOrgId and StateInSys='8' and Completer=@Completer)
Std是基础数据表,StdRelDoc是关系表,StdRelDoc的StdID和Std的ID 相互关联,我想删除Std中的数据,首先得删掉StdRelDoc相关的数据,但是现在是这个关联的字段名字不一样,貌似不能用in操作,不知道怎么删除StdRelDoc 中的数据。还请大家帮帮忙
set QUOTED_IDENTIFIER ON
go
ALTER proc [dbo].[StdRelDocAndApp_DelStdRelDoc2]
(
@StdOrgId varchar(8),
@completer varchar(8)
)
as
delete from StdRelDoc where StdRelDoc.StdID in(select Std.ID from Std where StdOrgId=@StdOrgId and StateInSys='8' and Completer=@Completer)
Std是基础数据表,StdRelDoc是关系表,StdRelDoc的StdID和Std的ID 相互关联,我想删除Std中的数据,首先得删掉StdRelDoc相关的数据,但是现在是这个关联的字段名字不一样,貌似不能用in操作,不知道怎么删除StdRelDoc 中的数据。还请大家帮帮忙
并不去管括号里的数据是从何而来,只管里的数据值是多少,std.id所获得的id只是个值,与in(3,5,8)没什么两样.所以
貌似能操作.
declare @T table (col int)
insert into @T
select 1 union all
select 2 union all
select 3 union all
select 4 union all
select 5delete from @T where col in(select col from @T where col>3)select * from @T
/*
col
-----------
1
2
3
*/只是举例说明一下,in后面可以用子查询,可以作为删除的条件。
--先把要删除的ID保存到临时表
select Std.ID into #t from Std where StdOrgId=@StdOrgId and StateInSys='8' and Completer=@Completer--删除关系表
delete from Std where StdOrgId=@StdOrgId and StateInSys='8' and Completer=@Completer
--删除基础表
delete from StdRelDoc where StdRelDoc.StdID in(select ID from #t)
--删除临时表
drop table #t
--> --> (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)
*/
--> --> (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)
*/--重新执行测试数据后用方法2
方法2:alter table #T add ID int identity--新增标识列
go
delete a from #T a where exists(select 1 from #T where Num=a.Num and Name=a.Name and ID>a.ID)--只保留一条记录
go
alter table #T drop column ID--删除标识列--查看结果
select * from #T/*
Num Name
----------- ----
1 A
2 B(2 行受影响)*/--重新执行测试数据后用方法3
方法3:
declare Roy_Cursor cursor local for
select count(1)-1,Num,Name from #T group by Num,Name having count(1)>1
declare @con int,@Num int,@Name nvarchar(1)
open Roy_Cursor
fetch next from Roy_Cursor into @con,@Num,@Name
while @@Fetch_status=0
begin
set rowcount @con;
delete #T where Num=@Num and Name=@Name
set rowcount 0;
fetch next from Roy_Cursor into @con,@Num,@Name
end
close Roy_Cursor
deallocate Roy_Cursor--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B(2 行受影响)
*/
where m.StdID = n.ID
and StdOrgId=@StdOrgId and StateInSys='8' and Completer=@Completer
from StdRelDoc t
join Std on Std.ID=t.StdRelDoc
where StdRelDoc.StdOrgId=@StdOrgId and StdRelDoc.StateInSys='8' and StdRelDoc.Completer=@Completer