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Mysql Joints And Fetch Array


i use joints in my query for example.  $query = "SELECT a.id, b.name FROM xxx AS a, yyy AS b WHERE a.id=b.id" and execute this query and use:

$res = mysql_fetch_array($query);

now.... how do i get the value..

is it
         $val = $res['a.id']

or

   $val = $res['id']




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