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POMYSQL: Retrieve latest unique records
 

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    <p>I have a table that logs rows where the member_id repeats.</p> <h2>The column fields are:</h2> <p><strong>id:</strong> int(7) Primary key, Auto increment <br/> <strong>member_id:</strong> int(7) Index <br/> <strong>item_qt:</strong> int(7) <br/></p> <pre><code>+----+-----------+---------+----------+ | id | member_id | item_qt |timestamp | +----+-----------+---------+----------+ |553 | 107 | 10 | 00:17:53 | +----+-----------+---------+----------+ |552 | 107 | 25 | 00:17:51 | +----+-----------+---------+----------+ |551 | 122 | 6 | 00:17:43 | +----+-----------+---------+----------+ |550 | 122 | 9 | 00:17:22 | +----+-----------+---------+----------+ |549 | 107 | 19 | 00:17:11 | +----+-----------+---------+----------+ </code></pre> <p><br /><br /></p> <h2>First, <strong>what query would retrieve these results?</strong></h2> <ul> <li>select the latest unique rows</li> </ul> <p>(This post gave me some direction) <a href="https://stackoverflow.com/questions/1227619/retrieve-last-latest-distinct-highest-value"><a href="https://stackoverflow.com/questions/1227619/retrieve-last-latest-distinct-highest-value">Retrieve last (latest) distinct highest value</a></a></p> <pre><code>+----+-----------+---------+----------+ | id | member_id | item_qt |timestamp | +----+-----------+---------+----------+ |553 | 107 | 10 | 00:17:53 | +----+-----------+---------+----------+ |551 | 122 | 6 | 00:17:43 | +----+-----------+---------+----------+ </code></pre> <p><br /><br /></p> <h2>Next, <strong>How do you get this?</strong></h2> <pre><code>+----+-----------+---------+----------+-------------+ | id | member_id | item_qt |timestamp | item_qt_sum | +----+-----------+---------+----------+-------------+ |553 | 107 | 10 | 00:17:53 | 54 | +----+-----------+---------+----------+-------------+ |551 | 122 | 6 | 00:17:43 | 15 | +----+-----------+---------+----------+-------------+ </code></pre> <ul> <li>sum the item_qt for a number of rows in &lt; 5 minutes time</li> </ul>
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    1. CO@rrrfusco: I updated my answer based on what you provided.
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