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    <p>You can use a Calendar table defining then weeks and join it to your data.</p> <p>I've created a <a href="http://sqlfiddle.com/#!3/dc8e1/6" rel="nofollow">sql fiddle</a> for the following:</p> <pre><code>CREATE TABLE Calendar_Weeks ( week_start_date date, week_end_date date ) CREATE TABLE Sample_Data ( id int, start_date date, end_date date ) INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-04-18','2011-04-24') INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-04-25','2011-05-01') INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-05-02','2011-05-08') INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-05-09','2011-05-15') INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-05-16','2011-05-22') INSERT Calendar_Weeks (week_start_date, week_end_date) VALUES ('2011-05-23','2011-05-29') INSERT Sample_Data (id, start_date, end_date) VALUES (1, '2011-04-25','2011-05-08') INSERT Sample_Data (id, start_date, end_date) VALUES (2, '2011-04-23','2011-05-27') SELECT id, week_start_date, week_end_date FROM Sample_Data CROSS JOIN Calendar_Weeks WHERE week_start_date BETWEEN start_date AND end_date UNION SELECT id, week_start_date, week_end_date FROM Sample_Data CROSS JOIN Calendar_Weeks WHERE week_end_date BETWEEN start_date AND end_date </code></pre> <p>I have to admit the <code>UNION</code> of the queries <em>feels</em> a bit of a hack to include rows at the start or end of the set, so you might prefer to use Ravi Singh's solution.</p> <p>You can also use <code>INNER JOIN</code> if you like:</p> <pre><code>SELECT id, week_start_date, week_end_date FROM Sample_Data INNER JOIN Calendar_Weeks ON week_start_date BETWEEN start_date AND end_date UNION SELECT id, week_start_date, week_end_date FROM Sample_Data INNER JOIN Calendar_Weeks ON week_end_date BETWEEN start_date AND end_date </code></pre>
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    1. POSplit data between 2 dates in SQL
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    1. COThis is the solution I started to draft. The one thing I
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    2. COExcellent. If I could I'd give you +2. 1 for using SQL Fiddle and one for suggesting a calendar table.
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    3. COWould the person who down voted my answer care to explain why? I'm always interested in people's opinions...
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