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    <p>From the other case, and what you appear to be doing is to show the trend of values across some period of time, even though a value may not be provided every day... So, you may have from Oct 1, 2011 to Dec 1, 2011 (or any other date range for that matter).</p> <p>You can easily SIMULATE an entire range of dates by using mysql variables and joining to ANY table (where I have "AnyOtherTableInYourDatabase") that has at least the number of days you would want to look back at. In the example for just the dates, I am starting with whatever the current date is, and running back say... 60 days. You could also change the "starting date" with something else and go back/forward as needed.</p> <pre><code>select JustDates.OneDate from ( SELECT @r:= date_add(@r, interval 1 day ) OneDate FROM (select @r := current_date()) vars, AnyOtherTableInYourDatabase limit 30 ) JustDates </code></pre> <p>Now, to get the most recent "reading", tack on a column via a select/from. THEN, re-join THAT result set to the original readings table to get the value in question</p> <pre><code>select PreQuery.OneDate, PreQuery.LatestReading, Y2.Value from ( select JustDates.OneDate, ( select max( YRT.Date ) from YourReadingsTable YRT where YRT.Date &lt;= JustDates.OneDate ) as LatestReading from (SELECT @r:= date_add(@r, interval 1 day ) OneDate FROM (select @r := current_date()) vars, AnyOtherTableInYourDatabase limit 30 ) JustDates ) PreQuery JOIN YourReadingsTable Y2 on PreQuery.LatestReading = Y2.Date </code></pre>
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    1. POConvert a table with infrequent values for specific days to a table with all days in a period
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