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POMySQL : complex query dynamic select?
 

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    <p>I searching for many times now on a complex MySQL query.</p> <p>It's an achievement system.</p> <p>Structure of tables is simple and form is symmetric.</p> <p>The first table (achievements_base) contains the achievements reference : each achievement have : - an ID (id of the row, auto-increment &amp; unique), - a code_id (reference of the achievement), - a rank_id (sub-category of achievement's code_id), - and the achievement name (display purposes).</p> <p>The second table (achievements_user) contains the achievements obtained by the users : each achievement unlocked have : - an ID (if of the row, auto-increment &amp; unique), - the code_id (reference of the achievement), - a rank_id (sub-category of achievement's code_id), - and the user id.</p> <p>The tables syntax is :</p> <pre><code>achievements_base id - code_id - rank_id - name 1 - 1 - 1 - foo 2 - 1 - 2 - bar 3 - 1 - 3 - foobar 4 - 1 - 4 - foofoo 5 - 2 - 1 - barbar achievements_user id - code_id - rank_id - user_id 1 - 1 - 1 - 1 2 - 1 - 2 - 1 3 - 2 - 1 - 1 </code></pre> <p>I want to display achievements that user don't have (GROUP BY code_id)</p> <pre><code>In the table exemple above, for example, expected result is, for the user_id 1 : 3 - 1 - 3 - foobar </code></pre> <p>But I don't see how to do that ! I've already tried multiples queries.</p> <p>Sorry for my English, I'm French !</p> <p>Thanks !</p> <p>edit, example of one of queries that I've tried :</p> <pre><code>SELECT AB.name FROM achievements_base AB RIGHT JOIN achievements_users AU ON AU.code_id = AB.code_id AND AU.rank_id = AB.rank_id WHERE (SELECT COUNT(*) FROM achievements_users AU WHERE AU.user_id = 1) = 0 GROUP BY AB.code_id ORDER BY AB.code_id ASC </code></pre>
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    1. USFranck Boudraa
    1. USFranck Boudraa
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    1. CO[Show us what you have tried.](http://www.whathaveyoutried.com)
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    2. COSorry, updated !
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