表自链接有关问题，多谢！
日期：2014-05-18 浏览次数：20602 次
表自链接问题，急，在线等，谢谢！！！！！
有一个表，结构如下
一个采购申请单最多生成两条采购单(一条内采和一条外采)
也可能只生成内采和只生成外采
问题是怎么查询一个结果集，有内采和外采的只检索外采，即排除第二条数据
在线等,谢谢！
------解决方案--------------------
select * from (
select PURCHASEAPPLYNO,PURCHASENO,PURCHASETYPE
from tablename group by PURCHASEAPPLYNO,PURCHASENO,PURCHASETYPE
having(PURCHASEAPPLYNO)>=2)as a
where PURCHASETYPE='外采'
------解决方案--------------------
select * from Z_PURCHASETBL B
where B.PURCHASETYPE='2' --外采
union
select * from Z_PURCHASETBL a
where A.PURCHASETYPE='1' --内采
and a.PURCHASEAPPLYNO not in
(
select PURCHASEAPPLYNO
from Z_PURCHASETBL group by PURCHASEAPPLYNO
having(count(PURCHASEAPPLYNO))=2
)
------解决方案--------------------
有一个表，结构如下
- SQL code
采购申请单号 采购单号 采购类型 PURCHASEAPPLYNO PURCHASENO PURCHASETYPE PA001 P001 外采 PA001 P002 内采 PA002 P003 外采 PA003 P004 内采
一个采购申请单最多生成两条采购单(一条内采和一条外采)
也可能只生成内采和只生成外采
问题是怎么查询一个结果集，有内采和外采的只检索外采，即排除第二条数据
在线等,谢谢！
------解决方案--------------------
select * from (
select PURCHASEAPPLYNO,PURCHASENO,PURCHASETYPE
from tablename group by PURCHASEAPPLYNO,PURCHASENO,PURCHASETYPE
having(PURCHASEAPPLYNO)>=2)as a
where PURCHASETYPE='外采'
------解决方案--------------------
select * from Z_PURCHASETBL B
where B.PURCHASETYPE='2' --外采
union
select * from Z_PURCHASETBL a
where A.PURCHASETYPE='1' --内采
and a.PURCHASEAPPLYNO not in
(
select PURCHASEAPPLYNO
from Z_PURCHASETBL group by PURCHASEAPPLYNO
having(count(PURCHASEAPPLYNO))=2
)
------解决方案--------------------
- SQL code
if object_id('tb') is not null
drop table tb
go
create table tb
(
PURCHASEAPPLYNO varchar(10),
PURCHASENO varchar(10),
PURCHASETYPE varchar(10)
)
go
insert into tb
select 'PA001','P001','外采' union all
select 'PA001','P002','内采' union all
select 'PA002','P003','外采' union all
select 'PA003','P004','内采'
go
select PURCHASEAPPLYNO,PURCHASENO,PURCHASETYPE from
(
select *,row=row_number() over(partition by PURCHASEAPPLYNO order by getdate()) from tb
)t where row=1
go
/*
PURCHASEAPPLYNO PURCHASENO PURCHASETYPE
--------------- ---------- ------------
PA001 P001 外采
PA002 P003 外采
PA003 P004 内采
(3 行受影响)
*/
------解决方案--------------------
- SQL code
----------------------------
-- Author :fredrickhu(小F，向高手学习)
-- Date :2011-12-20 16:15:31
-- Version:
-- Microsoft SQL Server 2008 R2 (RTM) - 10.50.1617.0 (Intel X86)
-- Apr 22 2011 11:57:00
-- Copyright (c) Microsoft Corporation
-- Enterprise Evaluation Edition on Windows NT 6.1 <X64> (Build 7600: ) (WOW64)
--
----------------------------
--> 测试数据：[tb]
if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([PURCHASEAPPLYNO] varchar(5),[PURCHASENO] varchar(4),[PURCHASETYPE] varchar(4))
insert [tb]
select 'PA001','P001','外采' union all
select 'PA001','P002','内采' union all
select 'PA002','P003','外采' union all
select 'PA003','P004','内采'
--------------开始查询--------------------------
select * from tb t where PURCHASENO=(select MIN(PURCHASENO) from tb where PURCHASEAPPLYNO=t.PURCHASEAPPLYNO)
----------------结果----------------------------
/*
PURCHASEAPPLYNO PURCHASENO PURCHASETYPE
--------------- ---------- ------------
PA001 P001 外采
PA002 P003 外采
PA003 P004 内采
(3 行受影响)
*/
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