在where子句中使用计算列

I'm trying to use a calculated column in a where clause.

我正在尝试在where子句中使用计算列。

I've trying everything from CROSS APPLY, to sub-query select but it does not give me the anything near what I need.

我已尝试从CROSS APPLY到子查询选择的所有内容,但它并没有给我任何接近我需要的东西。

My query so far:

我的查询到目前为止:

SELECT p.Code, c.AccountNumber, Sales = (SUM(p.UnitPrice) * SUM(od.QtyShipped)) FROM [dbo].Customer c 
    LEFT JOIN [dbo].OrderHeader oh ON oh.CustomerId = c.Id 
    LEFT JOIN [dbo].OrderDetail od ON od.OrderHeaderId = oh.Id
    LEFT JOIN [dbo].Product p ON p.Id = od.ProductId
WHERE Sales > 100
GROUP BY p.Code, c.AccountNumber, Sales

This does not work, as 'Sales' is an invalid column

这不起作用,因为'Sales'是无效的列

3 个解决方案

#1

You'll need to wrap the inner query in a derived table or CTE in order to be able to use derived columns in the WHERE clause (Also, note SUM() is specified just once, after the multiplication):

您需要将内部查询包装在派生表或CTE中,以便能够在WHERE子句中使用派生列(另外,注意SUM()仅在乘法后指定一次):

SELECT x.Code, x.AccountNumber, x.Sales
FROM
(
  SELECT p.Code, c.AccountNumber, SUM(p.UnitPrice *od.QtyShipped) AS Sales 
  FROM [dbo].Customer c 
      LEFT JOIN [dbo].OrderHeader oh ON oh.CustomerId = c.Id 
      LEFT JOIN [dbo].OrderDetail od ON od.OrderHeaderId = oh.Id
      LEFT JOIN [dbo].Product p ON p.Id = od.ProductId
  GROUP BY p.Code, c.AccountNumber
) AS x
WHERE x.Sales > 100;

#2

If it's a calculated column you can use "HAVING".

如果它是计算列,您可以使用“HAVING”。

SELECT p.Code, c.AccountNumber, Sales = (SUM(p.UnitPrice) * SUM(od.QtyShipped)) FROM [dbo].Customer c 
    LEFT JOIN [dbo].OrderHeader oh ON oh.CustomerId = c.Id 
    LEFT JOIN [dbo].OrderDetail od ON od.OrderHeaderId = oh.Id
    LEFT JOIN [dbo].Product p ON p.Id = od.ProductId
GROUP BY p.Code, c.AccountNumber, Sales
HAVING SALES > 100;

#3

You can use the common table expression for this

您可以使用公用表表达式

`;WITH CTE AS
(
SELECT p.Code, c.AccountNumber, Sales = (SUM(p.UnitPrice) * SUM(od.QtyShipped)) FROM [dbo].Customer c 
    LEFT JOIN [dbo].OrderHeader oh ON oh.CustomerId = c.Id 
    LEFT JOIN [dbo].OrderDetail od ON od.OrderHeaderId = oh.Id
    LEFT JOIN [dbo].Product p ON p.Id = od.ProductId

GROUP BY p.Code, c.AccountNumber, Sale

)

SELECT
*
FROM 
CTE WHERE CTE.Sales>100 `

#1