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POHow can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
 

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  1. POHow can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
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    <p><strong>My table is:</strong> </p> <pre><code>id home datetime player resource ---|-----|------------|--------|--------- 1 | 10 | 04/03/2009 | john | 399 2 | 11 | 04/03/2009 | juliet | 244 5 | 12 | 04/03/2009 | borat | 555 3 | 10 | 03/03/2009 | john | 300 4 | 11 | 03/03/2009 | juliet | 200 6 | 12 | 03/03/2009 | borat | 500 7 | 13 | 24/12/2008 | borat | 600 8 | 13 | 01/01/2009 | borat | 700 </code></pre> <p>I need to select each distinct <code>home</code> holding the maximum value of <code>datetime</code>. </p> <p><strong>Result would be:</strong> </p> <pre><code>id home datetime player resource ---|-----|------------|--------|--------- 1 | 10 | 04/03/2009 | john | 399 2 | 11 | 04/03/2009 | juliet | 244 5 | 12 | 04/03/2009 | borat | 555 8 | 13 | 01/01/2009 | borat | 700 </code></pre> <p><strong>I have tried:</strong></p> <pre><code>-- 1 ..by the MySQL manual: SELECT DISTINCT home, id, datetime AS dt, player, resource FROM topten t1 WHERE datetime = (SELECT MAX(t2.datetime) FROM topten t2 GROUP BY home) GROUP BY datetime ORDER BY datetime DESC </code></pre> <p>Doesn't work. Result-set has 130 rows although database holds 187. Result includes some duplicates of <code>home</code>.</p> <pre><code>-- 2 ..join SELECT s1.id, s1.home, s1.datetime, s1.player, s1.resource FROM topten s1 JOIN (SELECT id, MAX(datetime) AS dt FROM topten GROUP BY id) AS s2 ON s1.id = s2.id ORDER BY datetime </code></pre> <p>Nope. Gives all the records.</p> <pre><code>-- 3 ..something exotic: </code></pre> <p>With various results.</p>
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