获取随机查询结果，然后对其进行排序

Question

I need to run an ORDER BY RAND query and then sort the resulting data set numerically. In other words I want a random set of data (in this case 7 numbers), but then I need to sort those 7 results numerically.

After this code runs:

if ($today == "Oct 31") { 

  $dayList = "halloween"; 
  $stmt = $pdo->query("SELECT `rand` FROM `jukebox2014` 
           WHERE `class` = '$dayList' ORDER BY RAND() LIMIT 7");
}

I need to sort the 7 results.

Any ideas?

Thanks.

Answer 1

As simple as:

SELECT `rand`
FROM (
    SELECT ... ORDER BY RAND() LIMIT 7
)
ORDER BY `rand`

Not that ORDER BY RAND() LIMIT 7 is a rather inefficient method to select random data; more efficient methods will depend on your exact data. Search Stackoverflow for many questions regarding this topic.

Answer 2

I think this is what you mean.

$new = array();
foreach ($results as $result) {
    $new[] $result['rand'];
}

$sorted = ksort($new);