I'm trying to do (what I thought was) a simple update query, but clearly it's out there to bite me.

PHP Code:
$sql "UPDATE hearings SET 
               WHERE id=
           if (@
mysql_query($sql)) { 
'<p class="thanks">This hearing has been updated.</p>';
           } else { 
'<p>Error updating hearing: ' 
mysql_error() . '</p>'
The error prints out my id variable, so I know that it exists and is the correct one. But I continue to get:

Error updating hearing: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE `id`=56' at line 13
Can't for the life of me find the problem.