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    <p>Could you please try the following:</p> <pre><code>SELECT Count(*) FROM yourtable where dateColumn between Now() and Now() - Interval 30 Day </code></pre> <p>It needs some looping, for a better answer to isolote all 30 days intervals going back. As you also need a 30 day interval between min(Date) in the table and the last loop date :) Or to the least another table that carries the dates of each 30 day interval, and then join.</p> <p>Here is getting count just by each calendar month. Not exactly what you need.</p> <pre><code>SELECT extract(month from datecolumn), count(*) FROM yourtable GROUP BY extract(month from datecolumn); </code></pre> <p>Given a thought to my latter comment and Stefan's comment, here is a long code yet with proper resutls. Based on my own sample data and compatible with MYSQL with <code>interval</code>. If you need to use with SQL Server please use <code>DateADD</code> or quivalent function.</p> <ul> <li><a href="http://sqlfiddle.com/#!2/a4093/3" rel="nofollow">SQLFIDDLE</a></li> </ul> <p>Sample data:</p> <pre><code>ID_MAIN FIELD1 FILTER ---------------------------------------- 1 red August, 05 2012 00:00:00+0000 2 blue September, 15 2012 00:00:00+0000 3 pink September, 20 2012 00:00:00+0000 4 blue September, 27 2012 00:00:00+0000 5 blue October, 02 2012 00:00:00+0000 6 blue October, 16 2012 00:00:00+0000 7 blue October, 22 2012 00:00:00+0000 8 pink November, 12 2012 00:00:00+0000 9 pink November, 28 2012 00:00:00+0000 10 pink December, 01 2012 00:00:00+0000 11 pink December, 08 2012 00:00:00+0000 12 pink December, 22 2012 00:00:00+0000 </code></pre> <p>Query:</p> <pre><code>set @i:= 0; SELECT MIN(filter) INTO @mindt FROM MAIN ; select count(a.id_main), y.dateInterval, (y.dateInterval - interval 29 day) as lowerBound from main a join ( SELECT date_format(Now(),'%Y-%m-%d') as dateInterval from dual union all select x.dateInterval from ( SELECT date_format( DATE(DATE_ADD(Now(), INTERVAL @i:=@i-29 DAY)),'%Y-%m-%d') AS dateInterval FROM Main, (SELECT @i:=0) r HAVING datediff(dateInterval,@mindt) &gt;= 30 order by dateInterval desc) as x) as y on a.filter &lt;= y.dateInterval and a.filter &gt; (y.dateInterval - interval 29 day) group by y.dateInterval order by y.dateInterval desc ; </code></pre> <p>Results:</p> <pre><code>COUNT(A.ID_MAIN) DATEINTERVAL LOWERBOUND ---------------------------------------------- 2 2012-12-30 2012-12-01 3 2012-12-01 2012-11-02 2 2012-11-02 2012-10-04 4 2012-10-04 2012-09-05 </code></pre>
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    1. POCount the number of rows in 30 day bins
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    1. CONOW() should be replaced by some variable, because seanieb also wants to get the 30-day interval 60 days ago, 90 days ago and so on.
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    2. COThanks @Stefan Perhaps `Extract(month` could be a better idea ;)
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    3. CODoing it by month is trivial. The question is explicitly about rolling 30 day buckets/intervals.
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