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    <p>I'm struggling with the ActiveAtEnd value, but the others are OK.</p> <p>This is for MySQL:</p> <pre><code>set @active:=0; select period, sum( if( score=1, 1, 0)) New, if( max(ab) &gt; max(aa), max(ab), max(aa)) MaxActive, if( min( ab ) &lt; min( aa ), min(ab), min(aa)) MinActive from ( select period, etime, score, @active ab, @active:=@active+score aa from ( select from_unixtime( floor( unix_timestamp(start)/600) * 600) period, start etime, +1 score from ev union all select from_unixtime( floor( unix_timestamp(end)/600) * 600) period, end etime, -1 score from ev ) event order by etime ) as temp group by period; </code></pre> <p>The innermost selection breaks the original table into a set of events - with a score of +1 for a start-event, and -1 for an end event. union all is used so that duplicate events are allowed.</p> <p>The next inner selection runs a variable across the score values - @active holds a count of the number of active intervals at each time point. Both the value of @active before and after the current count is added is selected: I do not know how portable this is.</p> <p>The outermost selection accumulates the results for each period. 'New' is the sum of '+1' scores, MaxActive and MinActive must both take the value of active before (ab) and active after (aa) into account.</p> <p>Here are sample results:</p> <pre><code>+---------------------+------+-----------+-----------+ | period | New | MaxActive | MinActive | +---------------------+------+-----------+-----------+ | 2008-11-19 10:00:00 | 3 | 3 | 0 | | 2008-11-19 10:10:00 | 1 | 2 | 1 | | 2008-11-19 10:20:00 | 0 | 2 | 1 | | 2008-11-19 10:30:00 | 1 | 2 | 1 | | 2008-11-19 10:40:00 | 0 | 1 | 0 | +---------------------+------+-----------+-----------+ </code></pre>
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    1. POSQL summarize min/max active for time ranges
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