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POMysql Query for Latest High Scores, not the Highest High scores
 

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  1. POMysql Query for Latest High Scores, not the Highest High scores
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    <p>Edit: SOLVED by Ian &amp; Mark...</p> <p>The high scores for a game need to be fetched from a MySQL database (using php). The query I use works fine for stats that always increase in time. The query however does not work for stats that can go up or down in time.</p> <p><strong>Some details:</strong></p> <p>The stats for players are stored in the <code>stats</code> table. Multiple rows per player (all updates), an auto_increment column is Primary key.</p> <pre><code>CREATE TABLE IF NOT EXISTS `stats` ( `id` int(11) NOT NULL AUTO_INCREMENT, `stamp` bigint(20) NOT NULL, `username` varchar(255) NOT NULL, `kill` int(11) NOT NULL, `death` int(11) NOT NULL, `kdr` decimal(6,3) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=956 ; </code></pre> <p>Some sample data:</p> <pre><code>1, 1365175892, user1, 1089, 191, 5.702 2, 1365175892, user2, 1805, 547, 6.709 3, 1365175892, user3, 104397, 2272, 45.949 4, 1365175892, user1, 1163, 200, 5.815 5, 1365175892, user2, 1090, 204, 5.343 </code></pre> <p>The Kills &amp; Deaths increment by time and thus it is simple to create a top 10.</p> <p><strong>The issue</strong></p> <p>For the Kill to Death Ratio (KDR), the value can go up or down in time. Example: user2 in update 5 has a lower KDR that in update 2, but still my high score list shows the highest KDR of update 2, while I actually need the lower KDR from update 5.</p> <p>So here, for the top 10, I do not need the Highest value (that would be automatically the last value stored for each player) but the LATEST value (that is not nescesarily the highest value). And I can't get it to work...</p> <p>One of the queries I tried is this one that works for increasing-only-stats:</p> <pre><code>SELECT s.* FROM stats AS s INNER JOIN ( SELECT username, MAX(kdr) AS kdr FROM stats GROUP BY username ) AS groupedstats ON s.username = groupedstats.username AND s.kdr = groupedstats.kdr ORDER BY kdr DESC LIMIT 10 </code></pre> <p>Could anyone help me how to get the the correct kdr high-score list? I'm lost...</p> <p>Thanks</p>
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    1. COThe latest one is the one with the highest id, right - in which case it beggars belief that you cannot solve this for yourself!
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      1. USStrawberry
 

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