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POMySQL GROUP CONCAT duplicates
 

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    <p>I have a table of results that looks like this:</p> <pre><code>score_id, uid, af_id, level, record_date </code></pre> <p>Where <code>uid</code> is the user id of a user on the system. <code>af_id</code> is a focus which a level has been set at. An <code>af_id</code> will be either 1.1, 1.2, 1.3. <code>Level</code> is an integer value, ranging from 3 - 7.</p> <p>A sample data set would be:</p> <pre><code>1, 2, 1.1, 4, 2012-09-02 2, 2, 1.2, 4, 2012-09-02 3, 2, 1.3, 3, 2012-09-02 4, 2, 1.3, 4, 2012-11-30 </code></pre> <p>I need to query the database to collect what level a user has reached for each <code>af_id</code> between certain dates. I am using <code>GROUP_CONCAT</code> to bring the data into one row. My query works for the first period of time, but produces duplicates there after. My SQL so far is:</p> <pre><code>SELECT u.uid, u.forename, u.surname, ui.gender, GROUP_CONCAT(us.level ORDER BY us.af_id SEPARATOR ',') AS levels FROM users u LEFT OUTER JOIN user_scores us ON us.uid=u.uid AND us.record_date &gt; '2012-09-01' AND us.record_date &lt; '2012-10-20' JOIN user_info ui ON ui.uid =u.uid GROUP BY u.uid ORDER BY u.surname ASC </code></pre> <p>This gives the result:</p> <pre><code>Joe Bloggs M 4,4,3 </code></pre> <p>I want to be able to widen the months so that my query will be able to return updated results for af_id's. So if I widen the results dates to range between 2012-09-01 and 2012-12-31. I would like to see the following results:</p> <pre><code>Joe Bloggs M 4,4,4 </code></pre> <p>However, my query (using the above SQL) returns the following result:</p> <pre><code>Joe Bloggs M 4,4,3,4 </code></pre> <p>Any help with this would be much appreciated. Thanks in advance.</p>
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