POS表
os_id (单据类别) os_no (单号) itm(项次) prd_no(货品名) up(单价)
PO PO98120001 1 y001 0.1
PO PO98120001 2 y021 0.03
PO PO98120001 3 y036 0.5
PO PO98120002 1 y007 0.2
PO PO98120002 2 y021 0.08
OS OS98120001 1 c012 0.3
OS OS98120001 2 C013 0.5
PO PO98120003 1 y021 0.02
PO PO98120003 2 y036 0.7
PO PO98120003 3 y001 0.15
PO PO98120004 1 y001 0.13
PO PO98120004 2 y021 0.6
OS OS98120002 1 y2354 0.55
OS OS98120002 2 C123 0.66
我想查询出单据类别是PO的,货品最后一次采购单价,通过OS_NO能看出先后采购顺序。
os_id (单据类别) os_no (单号) itm(项次) prd_no(货品名) up(单价)
PO PO98120001 1 y001 0.1
PO PO98120001 2 y021 0.03
PO PO98120001 3 y036 0.5
PO PO98120002 1 y007 0.2
PO PO98120002 2 y021 0.08
OS OS98120001 1 c012 0.3
OS OS98120001 2 C013 0.5
PO PO98120003 1 y021 0.02
PO PO98120003 2 y036 0.7
PO PO98120003 3 y001 0.15
PO PO98120004 1 y001 0.13
PO PO98120004 2 y021 0.6
OS OS98120002 1 y2354 0.55
OS OS98120002 2 C123 0.66
我想查询出单据类别是PO的,货品最后一次采购单价,通过OS_NO能看出先后采购顺序。
SELECT 1 FROM TB T2 WHERE T2.OS_ID=T1.OS_ID AND T2.OS_NO>T1.OS_NO
)
WHERE NOT EXISTS(SELECT * FROM TB WHERE T.OS_ID=OS_ID AND OS_NO>T.OS_NO)
AND OS_ID='PO'
insert into pos values('PO' , 'PO98120001' , 1 , 'y001' , 0.1 )
insert into pos values('PO' , 'PO98120001' , 2 , 'y021' , 0.03)
insert into pos values('PO' , 'PO98120001' , 3 , 'y036' , 0.5 )
insert into pos values('PO' , 'PO98120002' , 1 , 'y007' , 0.2 )
insert into pos values('PO' , 'PO98120002' , 2 , 'y021' , 0.08)
insert into pos values('OS' , 'OS98120001' , 1 , 'c012' , 0.3 )
insert into pos values('OS' , 'OS98120001' , 2 , 'C013' , 0.5 )
insert into pos values('PO' , 'PO98120003' , 1 , 'y021' , 0.02)
insert into pos values('PO' , 'PO98120003' , 2 , 'y036' , 0.7 )
insert into pos values('PO' , 'PO98120003' , 3 , 'y001' , 0.15)
insert into pos values('PO' , 'PO98120004' , 1 , 'y001' , 0.13)
insert into pos values('PO' , 'PO98120004' , 2 , 'y021' , 0.6 )
insert into pos values('OS' , 'OS98120002' , 1 , 'y2354', 0.55)
insert into pos values('OS' , 'OS98120002' , 2 , 'C123' , 0.66)
goselect t.* from pos t where os_id = 'PO' and itm = (select max(itm) from pos where os_id = 'PO' and os_no = t.os_no) order by t.os_no
select t.* from pos t where os_id = 'PO' and not exists (select 1 from pos where os_id = 'PO' and os_no = t.os_no and itm > t.itm) order by t.os_no
/*
os_id os_no itm prd_no up
-------------------- -------------------- ----------- -------------------- --------------------
PO PO98120001 3 y036 .50
PO PO98120002 2 y021 .08
PO PO98120003 3 y001 .15
PO PO98120004 2 y021 .60(所影响的行数为 4 行)os_id os_no itm prd_no up
-------------------- -------------------- ----------- -------------------- --------------------
PO PO98120001 3 y036 .50
PO PO98120002 2 y021 .08
PO PO98120003 3 y001 .15
PO PO98120004 2 y021 .60(所影响的行数为 4 行)
*/select t.* from pos t where os_id = 'PO' and itm = (select max(itm) from pos where os_id = 'PO' and prd_no = t.prd_no) order by t.prd_no
select t.* from pos t where os_id = 'PO' and not exists (select 1 from pos where os_id = 'PO' and prd_no = t.prd_no and itm > t.itm) order by t.prd_no
/*
os_id os_no itm prd_no up
-------------------- -------------------- ----------- -------------------- --------------------
PO PO98120003 3 y001 .15
PO PO98120002 1 y007 .20
PO PO98120002 2 y021 .08
PO PO98120001 2 y021 .03
PO PO98120004 2 y021 .60
PO PO98120001 3 y036 .50(所影响的行数为 6 行)os_id os_no itm prd_no up
-------------------- -------------------- ----------- -------------------- --------------------
PO PO98120003 3 y001 .15
PO PO98120002 1 y007 .20
PO PO98120002 2 y021 .08
PO PO98120001 2 y021 .03
PO PO98120004 2 y021 .60
PO PO98120001 3 y036 .50(所影响的行数为 6 行)*/drop table pos
-- Author: Ken Wong
-- Create date: 2009-12-18 08:58:32
-- Description:
/*====================================================*/
--> 测试数据:[POS]
if object_id('[POS]') is not null drop table [POS]
create table [POS]([os_id] varchar(2),[os_no] varchar(10),[itm] int,[prd_no] varchar(5),[up] numeric(3,2))
insert [POS]
select 'PO','PO98120001',1,'y001',0.1 union all
select 'PO','PO98120001',2,'y021',0.03 union all
select 'PO','PO98120001',3,'y036',0.5 union all
select 'PO','PO98120002',1,'y007',0.2 union all
select 'PO','PO98120002',2,'y021',0.08 union all
select 'OS','OS98120001',1,'c012',0.3 union all
select 'OS','OS98120001',2,'C013',0.5 union all
select 'PO','PO98120003',1,'y021',0.02 union all
select 'PO','PO98120003',2,'y036',0.7 union all
select 'PO','PO98120003',3,'y001',0.15 union all
select 'PO','PO98120004',1,'y001',0.13 union all
select 'PO','PO98120004',2,'y021',0.6 union all
select 'OS','OS98120002',1,'y2354',0.55 union all
select 'OS','OS98120002',2,'C123',0.66select * from [POS] t
where [os_id]='PO'
and os_no+right('0000'+ltrim(itm),3)
in(select max(os_no+right('0000'+ltrim(itm),3)) from [POS]
where [os_id]=t.[os_id] and [prd_no]=t.[prd_no])
-----------------------------
PO PO98120004 1 y001 .13
PO PO98120002 1 y007 .20
PO PO98120004 2 y021 .60
PO PO98120003 2 y036 .70
SELECT * FROM POS A WHERE NOT EXISTS(SELECT 1 FROM POS B WHERE A.os_id = B.os_id
AND A.prd_no = B.prd_no AND A.os_no > B.os_no) AND A.os_id = 'PO'
--按某一字段分组取最大(小)值所在行的数据
--(爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 2007-10-23于浙江杭州)
/*
数据如下:
name val memo
a 2 a2(a的第二个值)
a 1 a1--a的第一个值
a 3 a3:a的第三个值
b 1 b1--b的第一个值
b 3 b3:b的第三个值
b 2 b2b2b2b2
b 4 b4b4
b 5 b5b5b5b5b5
*/
--创建表并插入数据:
create table tb(name varchar(10),val int,memo varchar(20))
insert into tb values('a', 2, 'a2(a的第二个值)')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('b', 1, 'b1--b的第一个值')
insert into tb values('b', 3, 'b3:b的第三个值')
insert into tb values('b', 2, 'b2b2b2b2')
insert into tb values('b', 4, 'b4b4')
insert into tb values('b', 5, 'b5b5b5b5b5')
go--一、按name分组取val最大的值所在行的数据。
--方法1:
select a.* from tb a where val = (select max(val) from tb where name = a.name) order by a.name
--方法2:
select a.* from tb a where not exists(select 1 from tb where name = a.name and val > a.val)
--方法3:
select a.* from tb a,(select name,max(val) val from tb group by name) b where a.name = b.name and a.val = b.val order by a.name
--方法4:
select a.* from tb a inner join (select name , max(val) val from tb group by name) b on a.name = b.name and a.val = b.val order by a.name
--方法5
select a.* from tb a where 1 > (select count(*) from tb where name = a.name and val > a.val ) order by a.name
/*
name val memo
---------- ----------- --------------------
a 3 a3:a的第三个值
b 5 b5b5b5b5b5
*/--二、按name分组取val最小的值所在行的数据。
--方法1:
select a.* from tb a where val = (select min(val) from tb where name = a.name) order by a.name
--方法2:
select a.* from tb a where not exists(select 1 from tb where name = a.name and val < a.val)
--方法3:
select a.* from tb a,(select name,min(val) val from tb group by name) b where a.name = b.name and a.val = b.val order by a.name
--方法4:
select a.* from tb a inner join (select name , min(val) val from tb group by name) b on a.name = b.name and a.val = b.val order by a.name
--方法5
select a.* from tb a where 1 > (select count(*) from tb where name = a.name and val < a.val) order by a.name
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 1 b1--b的第一个值
*/--三、按name分组取第一次出现的行所在的数据。
select a.* from tb a where val = (select top 1 val from tb where name = a.name) order by a.name
/*
name val memo
---------- ----------- --------------------
a 2 a2(a的第二个值)
b 1 b1--b的第一个值
*/--四、按name分组随机取一条数据。
select a.* from tb a where val = (select top 1 val from tb where name = a.name order by newid()) order by a.name
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 5 b5b5b5b5b5
*/--五、按name分组取最小的两个(N个)val
select a.* from tb a where 2 > (select count(*) from tb where name = a.name and val < a.val ) order by a.name,a.val
select a.* from tb a where val in (select top 2 val from tb where name=a.name order by val) order by a.name,a.val
select a.* from tb a where exists (select count(*) from tb where name = a.name and val < a.val having Count(*) < 2) order by a.name,a.val
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
a 2 a2(a的第二个值)
b 1 b1--b的第一个值
b 2 b2b2b2b2
*/--六、按name分组取最大的两个(N个)val
select a.* from tb a where 2 > (select count(*) from tb where name = a.name and val > a.val ) order by a.name,a.val
select a.* from tb a where val in (select top 2 val from tb where name=a.name order by val desc) order by a.name,a.val
select a.* from tb a where exists (select count(*) from tb where name = a.name and val > a.val having Count(*) < 2) order by a.name , a.val
/*
name val memo
---------- ----------- --------------------
a 2 a2(a的第二个值)
a 3 a3:a的第三个值
b 4 b4b4
b 5 b5b5b5b5b5
*/
--七,如果整行数据有重复,所有的列都相同。
/*
数据如下:
name val memo
a 2 a2(a的第二个值)
a 1 a1--a的第一个值
a 1 a1--a的第一个值
a 3 a3:a的第三个值
a 3 a3:a的第三个值
b 1 b1--b的第一个值
b 3 b3:b的第三个值
b 2 b2b2b2b2
b 4 b4b4
b 5 b5b5b5b5b5
*/
--在sql server 2000中只能用一个临时表来解决,生成一个自增列,先对val取最大或最小,然后再通过自增列来取数据。
--创建表并插入数据:
create table tb(name varchar(10),val int,memo varchar(20))
insert into tb values('a', 2, 'a2(a的第二个值)')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('b', 1, 'b1--b的第一个值')
insert into tb values('b', 3, 'b3:b的第三个值')
insert into tb values('b', 2, 'b2b2b2b2')
insert into tb values('b', 4, 'b4b4')
insert into tb values('b', 5, 'b5b5b5b5b5')
goselect * , px = identity(int,1,1) into tmp from tbselect m.name,m.val,m.memo from
(
select t.* from tmp t where val = (select min(val) from tmp where name = t.name)
) m where px = (select min(px) from
(
select t.* from tmp t where val = (select min(val) from tmp where name = t.name)
) n where n.name = m.name)drop table tb,tmp/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 1 b1--b的第一个值(2 行受影响)
*/
--在sql server 2005中可以使用row_number函数,不需要使用临时表。
--创建表并插入数据:
create table tb(name varchar(10),val int,memo varchar(20))
insert into tb values('a', 2, 'a2(a的第二个值)')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('b', 1, 'b1--b的第一个值')
insert into tb values('b', 3, 'b3:b的第三个值')
insert into tb values('b', 2, 'b2b2b2b2')
insert into tb values('b', 4, 'b4b4')
insert into tb values('b', 5, 'b5b5b5b5b5')
goselect m.name,m.val,m.memo from
(
select * , px = row_number() over(order by name , val) from tb
) m where px = (select min(px) from
(
select * , px = row_number() over(order by name , val) from tb
) n where n.name = m.name)drop table tb/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 1 b1--b的第一个值(2 行受影响)
*/
考虑的真全面啊,有几个单号的ITM位数真大于1了