请教一个合并计算的SQL语句？

[wisesuperman]

有一个表in_stock(月份mth,日期indate,编码stock_no名称stock_na)
月份----日期--------编码------名称--------进库数量
1 2012/1/2 001 TCL电视 5
1 2012/1/5 001 TCL电视 6
2 2012/2/6 001 TCL电视 10
1 2012/1/3 002 格力空调 20
1 2012/1/4 002 格力空调 20
2 2012/2/8 002 格力空调 30
...
用SELECT 语句怎么实现以下结果：
编码------名称--------1月份-----2月份------3月份....
001 TCL电视 11 10
002 格力空调 40 30
............................................................................

[sqlkxr]

select stock_no,stock_na,sum(case when mth=1 then jksl end)
1月份,sum(case when mth=2 then jksl end) 2月份  from in_stock
group by stock_no,stock_na

[daishaodong]

Group by 语句可以。

[我腫了]

USE test
GO
 
 
 
-->生成表in_stock
 
if object_id('in_stock') is not null 
    drop table in_stock
Go
Create table in_stock([mth] smallint,[indate] datetime,[stock_no] nvarchar(3),[stock_name] nvarchar(5),[qty] smallint)
Insert into in_stock
Select 1,'2012/1/2',N'001',N'TCL电视',5
Union all Select 1,'2012/1/5',N'001',N'TCL电视',6
Union all Select 2,'2012/2/6',N'001',N'TCL电视',10
Union all Select 1,'2012/1/3',N'002',N'格力空调',20
Union all Select 1,'2012/1/4',N'002',N'格力空调',20
Union all Select 2,'2012/2/8',N'002',N'格力空调',30
 
 
 
DECLARE @col NVARCHAR(MAX)
 
SELECT 
        @col=ISNULL(@col+',','')+'SUM(CASE WHEN mth='+LTRIM(mth)+' THEN qty END) As ['+LTRIM(mth)+'月份]'
    FROM in_stock
    GROUP BY mth
EXEC ( N'SELECT [stock_no] As 编码,[stock_name] As 名称,'+@col+' FROM in_stock GROUP BY [stock_no],[stock_name]' )
 
/*
编码   名称    1月份     2月份
---- ----- ----------- -----------
001  TCL电视 11          10
002  格力空调  40          30
*/

[骑着蜗牛去爬山]

declare @sql nvarchar(1000) select @sql=isnull(@sql,'')+',sum(case when mth='+rtrim(mth)+' then qty else 0 end)月份'+rtrim(mth) from (select distinct mth from tb)t set @sql='select stock_no,stock_name'+@sql+' from tb group by stock_no,stock_name' exec (@sql)

[ether030]

引用 2 楼 sqlkxr 的回复:

SQL code ? 12345 select stock_no,stock_na,sum(case when mth=1 then jksl end) 1月份,sum(case when mth=2 then jksl end) 2月份 from in_stock group by stock_no,stock_na

修改一下

select stock_no,stock_name,sum(case when mth=1 then qty end) '1月份',sum(case when mth=2 then qty end) '2月份'  from in_stock group by stock_no,stock_name

[andy_liucj]

declare @sql varchar(2000)
select @sql=isnull(@sql+',','')+'sum(case when mth='+ convert(varchar(2),mth)+' then qty else 0 end) '''+ convert(varchar(2),mth)+'月份''' 
from in_stock group by mth
exec('select [stock_no] 编码,[stock_name] 名称,'+@sql+' from in_stock group by stock_name, stock_no')