Question

我有一张叫做“Cart”的桌子。字段是：

CartId
ClientId
ProductId
Qty

现在我正在使用ProductMaster加入此表格以获取ProductName和ProuctPrice

select cc.CartId,cc.ProductId,pm.ProductName,cc.Qty,
        (pm.ProductPrice * cc.Qty) As SubTotal 
from ClientCart as cc 
    inner join ProductMaster as pm on cc.ProductId = pm.ProductId

现在我想使用动态字段GrandTotal生成SubTotal。我怎么能这样做？

Answer 1

with CTE as
(
select cc.CartId,cc.ProductId,pm.ProductName,cc.Qty,
        (pm.ProductPrice * cc.Qty) As SubTotal 
from ClientCart as cc 
    inner join ProductMaster as pm on cc.ProductId = pm.ProductId 
where cc.ClientId = @id
)
select *
from CTE
union
select null,null, null,null, sum(SubTotal) -- this is a grand total of all sub totals
from CTE

这不是正确的Rollup方法，但也不是你的，所以这样可以正常工作

Answer 2

试试这个：

select subtable.CartId, sum(subtable.SubTotal)
from (
select cc.CartId,cc.ProductId,pm.ProductName,cc.Qty,
        (pm.ProductPrice * cc.Qty) As SubTotal 
from ClientCart as cc 
inner join ProductMaster as pm on cc.ProductId = pm.ProductId 
where cc.ClientId = @id ) subtable
group by subtable.CartId;

如何在Sql Server中使用动态生成的字段？

2 个答案: