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POSQL query - aggregating by date
 

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    <p>I seem to have some hard time figuring out the right query for my problem, any help will be appreciated.</p> <p>I have <strong>2</strong> tables :</p> <p><strong>PatientExercise</strong> <code>(PatientID,ExerciseID,StartDate,EndDate)-first 3 are PK</code></p> <p><strong>PatientHistory</strong> <code>(PatientID,ExerciseID,CompletionDate) -all 3 are PK</code></p> <p>I'm trying to build 2 queries. </p> <p>The first needs to return the exercise completion percentage for a given Patient for a week (by days), and the second query should do the same for 3 months(by weeks).</p> <p>for example :</p> <p>PatientExercise: there cant be any overlap dates in this table(PatientExercise)</p> <pre><code>PatientID ExerciseID StartDate EndDate --------------------------------------------- 111 13 2013-04-28 2013-08-28 111 14 2013-04-28 2013-08-28 111 16 2013-04-28 2013-05-07 111 17 2013-05-09 2013-08-28 222 13 2013-04-28 2013-08-28 222 14 2013-04-28 2013-08-28 . . . </code></pre> <p>PatientHistory</p> <pre><code>PatientID ExerciseID CompletionDate ------------------------------------ 111 13 2013-04-28 111 13 2013-05-05 111 14 2013-05-05 111 13 2013-05-06 111 14 2013-05-06 111 13 2013-05-07 111 14 2013-05-07 111 16 2013-05-07 111 13 2013-05-08 </code></pre> <p>for patientID 111 with a giving start of the week date of 2013-05-05 query 1 results:</p> <pre><code>day Completion ------------------------------- 2013-05-05 66% -&gt;&gt; there are 3 exe's that has to be done on this date (13,14,16) and according to history he did only 2 (13,14) so 2/3 = 66% 2013-05-06 66% 2013-05-07 100% 2013-05-08 50% 2013-05-09 0% 2013-05-10 0% 2013-05-11 0% </code></pre> <p>and the same for second query but instead of day --> week.</p> <p>Thank you! </p>
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