Use calculated column in where clause
I am trying to use a calculated column in a where clause.
I've tried everything from CROSS APPLY, to selecting a sub-query, but it doesn't give me anything I need.
My request:
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 because "Sales" is an invalid column
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3 answers
You will need to wrap the inner query in a derived table or CTE to be able to use derived columns in a sentence WHERE
(Also, the note is SUM()
only given once after the multiplication):
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;
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If it is a computed column, you can use "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;
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You can use a generic table expression for this
`;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 `
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