如何用T-SQL写统计产品按月销售报表

怎么用T-SQL写统计产品按月销售报表？
SQL以前学过一点点基础的，稍微复杂一点的就不知道了。我搞了几个小时还是没有搞定，郁闷ing，希望各位童鞋指点。

有一张表Product数据有
ProductName Total inDate
Product1 1 2012-01-01 00:00:00.000
Product2 2 2012-01-23 00:00:00.000
Product3 3 2012-01-14 00:00:00.000
Product1 3 2012-02-24 00:00:00.000
Product2 2 2012-02-04 00:00:00.000
Product3 1 2012-02-29 00:00:00.000
Product1 10 2012-06-06 00:00:00.000
Product2 10 2012-06-16 00:00:00.000
Product3 10 2012-06-26 00:00:00.000
Product3 100 2012-06-16 00:00:00.000

要求得出的结果是：
产品名称 1月 2月 6月
product1 1 3 10
product2 2 2 10
product3 3 1 110

我写的SQL语句如下：
declare @sql varchar(8000)
set @sql = 'select ProductName 产品名称'

select @sql = @sql + ' , max(case inDate when ''' + CONVERT(varchar(100), inDate, 102) + ''' then Total else 0 end) '
from (select distinct inDate from Product) as a

set @sql = @sql + ' from (select ProductName,sum(Total) as Total,inDate from Product group by inDate,ProductName) as tb group by ProductName'

exec(@sql)

但是结果是安日统计的，不是按照要求按月统计的，我做过改动，始终达不到按月统计的报表。。。

------解决方案--------------------

SQL code

declare @sql varchar(8000)
set @sql = 'select ProductName 产品名称'

select @sql = @sql + ' ,max(case CONVERT(varchar(7),inDate,120) when ''' +dm+ ''' then Total else 0 end) as ['+dm+']'
from (select distinct CONVERT(varchar(7),inDate,120) as dm from Product) as a

set @sql = @sql + ' from Product group by ProductName'

exec(@sql)

------解决方案--------------------

SQL code


CREATE TABLE t1
(
    pname VARCHAR(10),
    total INT,
    indate DATETIME
)
INSERT INTO t1
SELECT 'Product1', 1, '2012-01-01 00:00:00.000' UNION ALL
SELECT 'Product2', 2, '2012-01-23 00:00:00.000' UNION ALL
SELECT 'Product3', 3, '2012-01-14 00:00:00.000' UNION ALL
SELECT 'Product1', 3, '2012-02-24 00:00:00.000' UNION ALL
SELECT 'Product2', 2, '2012-02-04 00:00:00.000' UNION ALL
SELECT 'Product3', 1, '2012-02-29 00:00:00.000' UNION ALL
SELECT 'Product1', 10, '2012-06-06 00:00:00.000' UNION ALL
SELECT 'Product2', 10, '2012-06-16 00:00:00.000' UNION ALL
SELECT 'Product3', 10, '2012-06-26 00:00:00.000' UNION ALL
SELECT 'Product3', 100, '2012-06-16 00:00:00.000'
SELECT * FROM t1

DECLARE @str VARCHAR(8000)
SET @str='select pname'
SELECT @str=@str+',max(case when month(indate)='+LTRIM(indate)+' then total else null end) as ['+LTRIM(indate)+'月'+']'
FROM (SELECT DISTINCT MONTH(indate) AS indate FROM t1) AS a1
SET @str=@str+' from t1 group by pname'
PRINT @str
EXEC (@str)

------------------
pname    1月    2月    6月
Product1    1    3    10
Product2    2    2    10
Product3    3    1    100

如何用T-SQL写统计产品按月销售报表

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