Why doesn't this work? Aliases.

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Why doesn't this work? Aliases.

Author

Topic

DavidChel
Constraint Violating Yak Guru

474 Posts

Posted - 2008-08-20 : 09:46:18

Here is the code which works:

SELECT fenumber,
	   finvqty,
	   forderqty,
	   fshipbook,
	   fshipbuy,
	   fshipmake,
	   fsono,
	   (forderqty -(fshipbook + fshipbuy + fshipmake)) AS LeftToShip,
	   (forderqty - finvqty) AS LeftToInvoice,
	   funetprice FROM dbo.sorels
	   WHERE (forderqty > (fshipbook + fshipbuy + fshipmake) AND forderqty > finvqty)
	   AND (forderqty -(fshipbook + fshipbuy + fshipmake)) <> (forderqty - finvqty)

Why can't I reference the Aliases in the Where clause such as this?

SELECT fenumber,
	   finvqty,
	   forderqty,
	   fshipbook,
	   fshipbuy,
	   fshipmake,
	   fsono,
	   (forderqty -(fshipbook + fshipbuy + fshipmake)) AS LeftToShip,
	   (forderqty - finvqty) AS LeftToInvoice,
	   funetprice FROM dbo.sorels
	   WHERE (forderqty > (fshipbook + fshipbuy + fshipmake) AND forderqty > finvqty)
	   AND LeftToShip <> LeftToInvoice

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2008-08-20 : 09:52:07

Because the query engine is not built that way.

E 12°55'05.25"
N 56°04'39.16"

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-08-20 : 10:01:53

however you can do it like this if you want:-

SELECT *
FROM
(
SELECT fenumber,
	   finvqty,
	   forderqty,
	   fshipbook,
	   fshipbuy,
	   fshipmake,
	   fsono,
	   (forderqty -(fshipbook + fshipbuy + fshipmake)) AS LeftToShip,
	   (forderqty - finvqty) AS LeftToInvoice,
	   funetprice FROM dbo.sorels
)t
WHERE (forderqty > (fshipbook + fshipbuy + fshipmake) AND forderqty > finvqty)
AND LeftToShip <> LeftToInvoice

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