Date: 10/28/08 (MySQL Communtiy) Keywords: mysql, sql I have a table as below (Slightly truncated, but the idea is there) +------------+-----------------------------------------+ | date | (sat0700 + sat0800 + sat0900 + sat1000) | +------------+-----------------------------------------+ | 2008-09-13 | 39 | | 2008-09-20 | 0 | | 2008-09-27 | 9 | | 2008-10-04 | 16 | | 2008-10-11 | 9 | | 2008-10-18 | 4 | | 2008-10-25 | 1 | +------------+-----------------------------------------+ I'd like to do some kind of select that adds a new column to the output for a rolling average So... mysql> SELECT date, (sat0700 + sat0800 + sat0900 + sat1000) AND SOMETHING ELSE FROM alerts WHERE date LIKE '2008%' ORDER BY date ASC;+------------+-----------------------------------------+---------+ | date | (sat0700 + sat0800 + sat0900 + sat1000) | average | +------------+-----------------------------------------+---------+ | 2008-09-13 | 39 | 39| | 2008-09-20 | 0 | 19.5| | 2008-09-27 | 9 | 16| | 2008-10-04 | 16 | 16| | 2008-10-11 | 9 | 14.6| | 2008-10-18 | 4 | 12.83| | 2008-10-25 | 1 | 11.14| +------------+-----------------------------------------+---------+ How would I go about writing such a query? The closest I've got so far is a running total, but can't seem to make the example fit an average
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