Sql 动态行转列 pivot

最近朋友有个需求：将产品中为“期刊”的书品以行转列的形式展现，同时需要关联工单主表及工单明细表，显示内容为，工单号、操作日期、产品名称及数量，由于期刊的产品数量较多，静态的虽然可以实现，但不利于后续内容的添加，就想着如何能以动态的形式展现，自动拼接sql语句处理，具体实现过程如下。

 产品信息表需用到的字段内容：

select ProductCode,Name  from ComProduct where ProductType ='20'

工单需要用到的内容：

select JobNo,ProductCode,Quantity  from WmsJobDtl 

 通过搜索资料，终于完成动态拼接SQL语句，具体的存储过程如下：

CREATE PROCEDURE 期刊核算汇总表

as 
begin


DECLARE @sql VARCHAR(8000)
DECLARE @COLUMN VARCHAR(8000)
 
SELECT @sql= ISNULL(@sql+',','')+ '['+ProductName+']'
    ,@COLUMN= ISNULL(@COLUMN,'')+', '+ProductName 


FROM (select wj.JobNo ,wj.StockDate, a.ProductName ,sum(wjd.Quantity) as TQty   from 
(select ProductCode,  Name as ProductName  
from ComProduct   where  ProductType ='20' ) as a 
inner  join  WmsJobDtl wjd on a.ProductCode = wjd.ProductCode
inner join WmsJob  wj on wj.JobNo = wjd.JobNo
where wj.Status = 'X'  
group by wj.JobNo ,wj.StockDate, a.ProductName) as cc 
GROUP BY ProductName           
 
SET @sql=' select  *  from
(select wj.JobNo ,wj.StockDate, a.ProductName ,sum(wjd.Quantity) as TQty   from 
(select ProductCode,  Name as ProductName  
from ComProduct   where  ProductType =''20'' ) as a 
inner  join  WmsJobDtl wjd on a.ProductCode = wjd.ProductCode
inner join WmsJob  wj on wj.JobNo = wjd.JobNo
where wj.Status = ''X''  
group by wj.JobNo ,wj.StockDate, a.ProductName
) as  dddd  pivot (max(TQty) for ProductName in ('+@sql+'))a'
 
exec   (@sql)

end

可惜，没有解决NULL值得问题，如有能解决的朋友，欢迎留言，非常感谢。