(PHP 4 <= 4.1.0, PECL dbplus >= 0.9)
dbplus_unselect — Remove a constraint from relation
$relation
   )
   Calling dbplus_unselect() will remove a
   constraint previously set by dbplus_find() on
   relation.
  
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.