Using Aliases in Where Clause or an Alternative Option?

Question

How do I get this to work, it works without the Where Clause, otherwise with the Where clause, i get the obvious error, but that\'s basically what needs to be done, anyone k

Answer 1

You can't use an alias (from SELECT clause) in WHERE clause because the logical processing order(section: Logical Processing Order of the SELECT statement) is WHERE and then SELECT:

FROM    
ON
JOIN
WHERE <--
GROUP BY
WITH CUBE or WITH ROLLUP
HAVING
SELECT <--
DISTINCT
ORDER BY <--
TOP

But, you can use an alias in ORDER BY:

SELECT  h.SalesOrderID, YEAR(h.OrderDate) OrderYear
FROM    Sales.SalesOrderHeader h
ORDER BY OrderYear;

Solutions: see the solutions presented by Mark Byers.

Tibor Karaszi: Why can't we have column alias in ORDER BY?