original_string: public function except(Query $query, $flag = null) {
          if ($flag === Dialect::ALL) {
              $query->attribute('flag', $flag);
          }
  
          return $this->_addCompound(Dialect::EXCEPT, $query);
      }
code: public function except(Query $query, $flag = null) {
          if ($flag === Dialect::ALL) {
              $query->attribute('flag', $flag);
          }
  
          return $this->_addCompound(Dialect::EXCEPT, $query);
      }
code_tokens: public function except ( Query $ query , $ flag = null ) { if ( $ flag === Dialect :: ALL ) { $ query -> attribute ( 'flag' , $ flag ) ; } return $ this -> _addCompound ( Dialect :: EXCEPT , $ query ) ; }
docstring: Add a select query as an except.
  
  @param \Titon\Db\Query $query
  @param string $flag
  @return $this
docstring_tokens: Add a select query as an except .