select distinct b.* from tb a cross apply (select top 2 * from tb where classid=a.classid order by amount desc)b
--1 ;with cte as ( select classid,sku,rn=ROW_NUMBER() over(partition by classid order by amount desc) from tb ) select classid,case when rn=1 then sku end as sku1, case when rn=2 then sku end as sku2 from cte where rn in(1,2)-- 2 select * from cte where rn in(1,2) order by classid,rn desc
横着排就是把竖着排的合并列值 合并列值 --******************************************************************************************* 表结构,数据如下: id value ----- ------ 1 aa 1 bb 2 aaa 2 bbb 2 ccc 需要得到结果: id values ------ ----------- 1 aa,bb 2 aaa,bbb,ccc 即:group by id, 求 value 的和(字符串相加) 1. 旧的解决方法(在sql server 2000中只能用函数解决。) --============================================================================= create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go --1. 创建处理函数 CREATE FUNCTION dbo.f_strUnite(@id int) RETURNS varchar(8000) AS BEGIN DECLARE @str varchar(8000) SET @str = '' SELECT @str = @str + ',' + value FROM tb WHERE id=@id RETURN STUFF(@str, 1, 1, '') END GO -- 调用函数 SELECt id, value = dbo.f_strUnite(id) FROM tb GROUP BY id drop table tb drop function dbo.f_strUnite go /* id value ----------- ----------- 1 aa,bb 2 aaa,bbb,ccc (所影响的行数为 2 行) */ --=================================================================================== 2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。) create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go -- 查询处理 SELECT * FROM(SELECT DISTINCT id FROM tb)A OUTER APPLY( SELECT [values]= STUFF(REPLACE(REPLACE( ( SELECT value FROM tb N WHERE id = A.id FOR XML AUTO ), ' <N value="', ','), '"/>', ''), 1, 1, '') )N drop table tb /* id values ----------- ----------- 1 aa,bb 2 aaa,bbb,ccc (2 行受影响) */ --SQL2005中的方法2 create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go select id, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '') from tb group by id /* id values ----------- -------------------- 1 aa,bb 2 aaa,bbb,ccc (2 row(s) affected) */
结果(竖着排 sql2) classid,sku 1,a2 1,a3 2,b2 2,b3 3,c1 3,c2 4,d2 --如果不在进行统计,直接计算 select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc) order by t.classid,t.amount desc--如果针对原表还需要统计,group by select m.* from ( select classid , sku , sum(amount) amount from tb group by classid , sku ) m where amount in (select top 2 amount from ( select classid , sku , sum(amount) amount from tb group by classid , sku ) n where n.classid = m.classid and n.sku = m.sku order by amount desc) order by m.classid,amount desc
结果(横着排 sql): classid,sku1,sku2 1,a2,a3 2,b2,b3 3,c1,c2 4,d2select classid, sku = stuff((select ',' + [value] from (select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc)) m where m.classid = n.classid for xml path('')) , 1 , 1 , '') from (select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc)) n group by classid
CREATE TABLE #temp (orderuid VARCHAR(10),classid INT,sku VARCHAR(10),amount INT) GOINSERT INTO #temp VALUES('so01',1,'a1',10) INSERT INTO #temp VALUES('so02',1,'a2',5) INSERT INTO #temp VALUES('so03',1,'a3',15) INSERT INTO #temp VALUES('so04',2,'b1',10) INSERT INTO #temp VALUES('so05',2,'b2',20) INSERT INTO #temp VALUES('so06',2,'b3',30) INSERT INTO #temp VALUES('so07',3,'c1',10) INSERT INTO #temp VALUES('so08',3,'c2',5) INSERT INTO #temp VALUES('so09',3,'c3',10) INSERT INTO #temp VALUES('so10',4,'d2',1) INSERT INTO #temp VALUES('so11',1,'a2',10) INSERT INTO #temp VALUES('so11',3,'c2',5)-- 横排 ;WITH CTE AS ( SELECT classid,sku,SUM(amount) AS amount FROM #temp GROUP BY classid,sku ),CTE_Two AS ( SELECT classid,sku,ROW_NUMBER()OVER(PARTITION BY classid ORDER BY amount DESC) AS orders FROM CTE ) SELECT classid ,sku1 = MAX(CASE WHEN orders = 1 THEN sku END) ,sku2 = MAX(CASE WHEN orders = 2 THEN sku END) FROM CTE_Two GROUP BY classid;--竖排 ;WITH CTE AS ( SELECT classid,sku,SUM(amount) AS amount FROM #temp GROUP BY classid,sku ),CTE_Two AS ( SELECT classid,sku,ROW_NUMBER()OVER(PARTITION BY classid ORDER BY amount DESC) AS orders FROM CTE ) SELECT classid,sku FROM CTE_Two WHERE orders IN (1,2);
CREATE TABLE tb (orderuid VARCHAR(10),classid INT,sku VARCHAR(10),amount INT) GOINSERT INTO tb VALUES('so01',1,'a1',10) INSERT INTO tb VALUES('so02',1,'a2',5) INSERT INTO tb VALUES('so03',1,'a3',15) INSERT INTO tb VALUES('so04',2,'b1',10) INSERT INTO tb VALUES('so05',2,'b2',20) INSERT INTO tb VALUES('so06',2,'b3',30) INSERT INTO tb VALUES('so07',3,'c1',10) INSERT INTO tb VALUES('so08',3,'c2',5) INSERT INTO tb VALUES('so09',3,'c3',10) INSERT INTO tb VALUES('so10',4,'d2',1) INSERT INTO tb VALUES('so11',1,'a2',10) INSERT INTO tb VALUES('so11',3,'c2',5) ; with c as ( select sum(amount) as sums,classid,sku from tb group by classid,sku)select classid,sku from(select classid,sku,row_number() over(partition by classid order by sums desc) as row from c) t where row=1 or row=2
distinct b.*
from
tb a
cross apply
(select top 2 * from tb where classid=a.classid order by amount desc)b
--1
;with cte as (
select classid,sku,rn=ROW_NUMBER() over(partition by classid order by amount desc) from tb
)
select classid,case when rn=1 then sku end as sku1, case when rn=2 then sku end as sku2
from cte where rn in(1,2)-- 2
select * from cte where rn in(1,2) order by classid,rn desc
合并列值
--*******************************************************************************************
表结构,数据如下:
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc 需要得到结果:
id values
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加) 1. 旧的解决方法(在sql server 2000中只能用函数解决。)
--=============================================================================
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
--1. 创建处理函数
CREATE FUNCTION dbo.f_strUnite(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SET @str = ''
SELECT @str = @str + ',' + value FROM tb WHERE id=@id
RETURN STUFF(@str, 1, 1, '')
END
GO
-- 调用函数
SELECt id, value = dbo.f_strUnite(id) FROM tb GROUP BY id
drop table tb
drop function dbo.f_strUnite
go
/*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为 2 行)
*/
--===================================================================================
2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。)
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
-- 查询处理
SELECT * FROM(SELECT DISTINCT id FROM tb)A OUTER APPLY(
SELECT [values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM tb N
WHERE id = A.id
FOR XML AUTO
), ' <N value="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb /*
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc (2 行受影响)
*/ --SQL2005中的方法2
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go select id, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '')
from tb
group by id /*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc (2 row(s) affected) */
classid,sku
1,a2
1,a3
2,b2
2,b3
3,c1
3,c2
4,d2
--如果不在进行统计,直接计算
select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc) order by t.classid,t.amount desc--如果针对原表还需要统计,group by select m.* from
(
select classid , sku , sum(amount) amount from tb group by classid , sku
) m where amount in (select top 2 amount from
(
select classid , sku , sum(amount) amount from tb group by classid , sku
) n where n.classid = m.classid and n.sku = m.sku order by amount desc)
order by m.classid,amount desc
classid,sku1,sku2
1,a2,a3
2,b2,b3
3,c1,c2
4,d2select classid, sku = stuff((select ',' + [value] from (select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc)) m where m.classid = n.classid for xml path('')) , 1 , 1 , '')
from (select t.* from tb t where amount in (select top 2 amount from tb where classid = m.classid order by amount desc)) n
group by classid
GOINSERT INTO #temp VALUES('so01',1,'a1',10)
INSERT INTO #temp VALUES('so02',1,'a2',5)
INSERT INTO #temp VALUES('so03',1,'a3',15)
INSERT INTO #temp VALUES('so04',2,'b1',10)
INSERT INTO #temp VALUES('so05',2,'b2',20)
INSERT INTO #temp VALUES('so06',2,'b3',30)
INSERT INTO #temp VALUES('so07',3,'c1',10)
INSERT INTO #temp VALUES('so08',3,'c2',5)
INSERT INTO #temp VALUES('so09',3,'c3',10)
INSERT INTO #temp VALUES('so10',4,'d2',1)
INSERT INTO #temp VALUES('so11',1,'a2',10)
INSERT INTO #temp VALUES('so11',3,'c2',5)-- 横排
;WITH CTE
AS
(
SELECT classid,sku,SUM(amount) AS amount
FROM #temp
GROUP BY classid,sku
),CTE_Two
AS
(
SELECT classid,sku,ROW_NUMBER()OVER(PARTITION BY classid ORDER BY amount DESC) AS orders
FROM CTE
)
SELECT classid
,sku1 = MAX(CASE WHEN orders = 1 THEN sku END)
,sku2 = MAX(CASE WHEN orders = 2 THEN sku END)
FROM CTE_Two
GROUP BY classid;--竖排
;WITH CTE
AS
(
SELECT classid,sku,SUM(amount) AS amount
FROM #temp
GROUP BY classid,sku
),CTE_Two
AS
(
SELECT classid,sku,ROW_NUMBER()OVER(PARTITION BY classid ORDER BY amount DESC) AS orders
FROM CTE
)
SELECT classid,sku FROM CTE_Two WHERE orders IN (1,2);
CREATE TABLE tb (orderuid VARCHAR(10),classid INT,sku VARCHAR(10),amount INT)
GOINSERT INTO tb VALUES('so01',1,'a1',10)
INSERT INTO tb VALUES('so02',1,'a2',5)
INSERT INTO tb VALUES('so03',1,'a3',15)
INSERT INTO tb VALUES('so04',2,'b1',10)
INSERT INTO tb VALUES('so05',2,'b2',20)
INSERT INTO tb VALUES('so06',2,'b3',30)
INSERT INTO tb VALUES('so07',3,'c1',10)
INSERT INTO tb VALUES('so08',3,'c2',5)
INSERT INTO tb VALUES('so09',3,'c3',10)
INSERT INTO tb VALUES('so10',4,'d2',1)
INSERT INTO tb VALUES('so11',1,'a2',10)
INSERT INTO tb VALUES('so11',3,'c2',5)
;
with c as
(
select sum(amount) as sums,classid,sku
from tb
group by classid,sku)select classid,sku
from(select classid,sku,row_number() over(partition by classid order by sums desc) as row from c) t
where row=1 or row=2