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POMySQL: applying a random sort on multiple columns
 

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  1. POMySQL: applying a random sort on multiple columns
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    <p>In order to have a well scrambled table (for a psychological experiment), I'd like to sort each column of my array by RAND(). Althrough this code works:</p> <pre><code>SELECT Sort.Variable1, Sort.Variable2 FROM Sort ORDER BY Variable1, Variable2 ASC LIMIT 0 , 30 </code></pre> <p>replacing "ASC" by "RAND()" make the query fail. Can someone give me an advice (even a solution with PHP) ? </p> <p>Thanks</p> <p>Edit:</p> <p>Thanks to all your responses, I finally did it. Here's my PHP code for this (and sorry for the old-fashioned-not-brand-new-PDO-queries). Even if it's maybe useless, I post it:</p> <pre><code> $i=0; //Describe to retrieve variables' names $sqlCol= 'DESCRIBE Sort'; $sqlCol= mysql_query($sqlCol); while ($res=mysql_fetch_array($sqlCol)) { $var[$i]=$res['Field']; $i++; } $NbCol=mysql_num_rows($sqlCol); //Number of column to shuffle // Number of items for each column $sqlCount= 'SELECT COUNT(*) FROM Sort'; $req2= mysql_query($sqlCount) or die ('Err'); $NbLignes= mysql_result($req2,0,0) or die ();//Number of rows //Data array $sql= "SELECT * FROM Sort"; $req= mysql_query($sql) or die ('Err'); $sort=mysql_fetch_array($req); for($i=0;$i&lt;$NbCol;$i++) { ${'sql'.$i}='SELECT * FROM Sort ORDER BY RAND()'; ${'input'.$i} = mysql_query(${'sql'.$i}); while(${'array'.$i}=mysql_fetch_array(${'input'.$i})) { $bigArray[$i][]=${'array'.$i}[$i]; } } for($i=0;$i&lt;$NbLignes;$i++) { echo '&lt;div id="q'.$i.'"style="margin-bottom: 50px; float:left"&gt;Question '.($i+1); echo '&lt;ul id="sortable'.$i.'" class="sortable"&gt;'; for($j=0;$j&lt;$NbCol;$j++) { echo '&lt;li class="ui-state-default" id="'.$var[$j].$i.'" name="'.$var[$j].$i.'"&gt;'. $bigArray[$j][$i].'&lt;/li&gt;'; } echo '&lt;/ul&gt;&lt;/div&gt;'; } </code></pre>
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    1. COCan you explain why `ORDER BY RAND()` won't do?
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    2. COHave you not already asked this question in a slightly different guise? http://stackoverflow.com/questions/3075115/mysql-php-order-each-column-of-an-array-randomly
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    3. COI won't deny you're true; I've tried every possible to do this with PHP (while, for, shuffle()...) since 2 days and I've looked at every post on the subject but I can't find an satisfying way to make it work. I feel sorry to post this again in another shell but this problem really drive me crazy and I look at every possible way to overcome this problem.
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