public function deriveColumns()
    {
        $derived = array();
        
        for ($i = 0; $i < count($this->columns); $i ++) {
            $derived[] = $this->deriveColumn($i);
        }
        
        return $derived;
    }
public function deriveColumns()
    {
        $derived = array();
        
        for ($i = 0; $i < count($this->columns); $i ++) {
            $derived[] = $this->deriveColumn($i);
        }
        
        return $derived;
    }
public function deriveColumns ( ) { $ derived = array ( ) ; for ( $ i = 0 ; $ i < count ( $ this -> columns ) ; $ i ++ ) { $ derived [ ] = $ this -> deriveColumn ( $ i ) ; } return $ derived ; }
Derives all expressions in the query's select clause as columns of the query's associated resultset.

@return multitype:Ambigous <\Aztech\Skwal\Query\multitype:\Aztech\Skwal\Expression\AliasExpression, \Aztech\Skwal\Expression\DerivedColumn>
Derives all expressions in the query s select clause as columns of the query s associated resultset .