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    <p>To do this in a set-based manner (which is what SQL is good at) you will need a set-based representation of your time increments. That can be a temporary table, a permanent table, or a derived table (i.e. subquery). I'm not too familiar with SQLite and it's been awhile since I've worked with UNIX. Timestamps in UNIX are just # seconds since some set date/time? Using a standard Calendar table (which is useful to have in a database)...</p> <pre><code>SELECT C1.start_time, C2.end_time, T.org, COUNT(time) FROM Calendar C1 INNER JOIN Calendar C2 ON C2.start_time = DATEADD(dy, 6, C1.start_time) INNER JOIN My_Table T ON T.time BETWEEN C1.start_time AND C2.end_time -- You'll need to convert to timestamp here WHERE DATEPART(dw, C1.start_time) = 1 AND -- Basically, only get dates that are a Sunday or whatever other day starts your intervals C1.start_time BETWEEN @start_range_date AND @end_range_date -- Period for which you're running the report GROUP BY C1.start_time, C2.end_time, T.org </code></pre> <p>The Calendar table can take whatever form you want, so you could use UNIX timestamps in it for the start_time and end_time. You just pre-populate it with all of the dates in any conceivable range that you might want to use. Even going from 1900-01-01 to 9999-12-31 won't be a terribly large table. It can come in handy for a lot of reporting type queries.</p> <p>Finally, this code is T-SQL, so you'll probably need to convert the DATEPART and DATEADD to whatever the equivalent is in SQLite.</p>
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