public function from($tables, $alias=null) {
		$this->tables = [];
		if(is_string($tables))
			return $this->addFrom($tables);
		else
			return $this->addFrom([$alias => $tables]);
	}
public function from($tables, $alias=null) {
		$this->tables = [];
		if(is_string($tables))
			return $this->addFrom($tables);
		else
			return $this->addFrom([$alias => $tables]);
	}
public function from ( $ tables , $ alias = null ) { $ this -> tables = [ ] ; if ( is_string ( $ tables ) ) return $ this -> addFrom ( $ tables ) ; else return $ this -> addFrom ( [ $ alias => $ tables ] ) ; }
Set FROM tables.
@param  string|array|dal $tables  Separated by ,
@param string            $alias
@return DAL              $this
@api
Set FROM tables .