How do we select a random row from a mysql result?

Question

$qry="SELECT * FROM `users` WHERE code LIKE '$querywc'";    
$res=mysql_query($qry);

this code fetches the rows based on the wildcards specified in the variable $querywc i'm sure that it'll return many rows. now what i want is, a random row from those results.

Answer 1

Order randomly and use limit to take just one row

SELECT * FROM `users` 
WHERE code = '$querywc'
ORDER BY rand()
LIMIT 1

Answer 2

执行速度更快：

SELECT TOP 1 * FROM `users` WHERE code LIKE '$querywc' order by rand();