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Message Posted: Wed, 20 Nov 2002 @ 19:35:35 GMT

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Subj:   Re: Can anyone explain this query
From:   David Wellman

This looks like it has come from one of the NCR courses.

Overall, the query is returning the average daily sales value. For instance, if the daily sales vaues for three days were 80, 90 and 100, this query would return a value of 90 as the single row answer.

The derived table portion...

SUM(Sales_Amount) FROM Sales_Hist GROUP BY
Period_Date) Temp(Daily_Amt);

calulates the total sales by date (date column is Period_Date).

The outer query portion...

SELECT AVG(Daily_Amt) AS Daily_Average FROM

then calculates the average of these daily sales totals.


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