mysql order by issue

Question

if i have a query like :

SELECT * FROM table  WHERE id IN (3,6,1,8,9);

this array of the ids is build in php dynamically , and the order is

Answer 1

I haven't tested but this PHP solution should work:

 $v){
    $sql .= 'WHEN ' . $v . ' THEN ' . $k . "\n";
}
$sql .= 'END ';

echo $sql;

?>

This generates the following SQL code:

SELECT * FROM table  WHERE id IN (3,6,1,8,9)
ORDER BY CASE id
WHEN 3 THEN 0
WHEN 6 THEN 1
WHEN 1 THEN 2
WHEN 8 THEN 3
WHEN 9 THEN 4
END