SQL动态生成列

数据表ProductSales如下：

现要实现如下效果：

 

思路如下（主要是拼接查询字符串）：

创建存储过程：SaleReport

 1 Create procedure SaleReport
 2 as
 3 begin
 4  declare @sql varchar(8000)
 5  set @sql = 'select Date'
 6 
 7  select @sql = @sql + ',isnull (sum(case Product when '''+Product+''' then SaleSum end),0) as ['+Product+']' 
 8  from (select distinct Product from ProductSales) as a
 9 
10  select @sql = @sql+' from ProductSales group by [Date]'
11  exec(@sql)
12 end

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