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Read A Topic

Return To Topics	Originally Posted: 6/23/2006 7:27:18 PM
	Last Updated: 6/23/2006 7:41:25 PM

Subject:

DailyChallenge 06/22/2006

You Asked....

I got today's question wrong and had a reference which seems to suggest I might have been right or that the question might be ambigious :

Source : http://publib.boulder.ibm.com/infocenter/rb63help/index.jsp?topic=/com.ibm.redbrick.doc6.3/ssg/ssg32.htm
A column alias can occur anywhere in a SELECT statement to designate the column to which it refers (for example, in a WHERE, ORDER BY , GROUP BY, or HAVING clause).

Important:
If the value contained in the column referenced by the column alias is the result of a set function, it cannot occur in the WHERE clause; however, it can occur in the HAVING clause.

Can you mail me for a clarification.

Question:

When a column is aliased in a SQL statement which of the following can utilize the column alias rather than having to use the names of the column from the table?

Example:

SELECT quantity*discount extprice FROM OrderDetails

and we responded....

I read your reference and you are correct.

However, this seems to be specific to a RedBrick implementation.

ANSI-SQL allows a column alias to be used on the ORDER BY clause but not on the HAVING, GROUP BY or WHERE.

others said....

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