sql多表行转列、级联行转列示例代码

现有两表A，B

A表存储商品点击日志，B表存储商品

要求显示当天所有商品点击量列表并附带总数并按天排序

代码如下：

declare @sql varchar(2000) 
set @sql='select CONVERT(varchar(100), a.[Time], 23) as 时间,count(b.title) as 总数' 
select @sql =@sql+ ',sum(case b.title when '''+Title+''' then 1 else 0 end) as '+'['+Title+']' 
from (select distinct title from B) as B 
set @sql=@sql+' from A as a left join B as b on a.AId=B.Aid 
group by CONVERT(varchar(100), a.[Time], 23) order by CONVERT(varchar(100), a.[Time], 23) desc' 
exec(@sql)

显示结果

时间	总数	商品1	商品2	商品3
2013-11-11	5	1	0	4
2013-11-10	13	2	11	1