public function select($columns = null)
	{
		$columns = func_get_args();

		$this->_select = array_merge($this->_select, $columns);

		return $this;
	}
public function select($columns = null)
	{
		$columns = func_get_args();

		$this->_select = array_merge($this->_select, $columns);

		return $this;
	}
public function select ( $ columns = null ) { $ columns = func_get_args ( ) ; $ this -> _select = array_merge ( $ this -> _select , $ columns ) ; return $ this ; }
Choose the columns to select from.

@param   mixed  $columns  column name or array($column, $alias) or object
@param   ...

@return  $this
Choose the columns to select from .