ORDER BY _column1, _column2; /* _column1升序，_column2升序 */ORDER BY _column1, _column2 DESC; /* _column1升序，_column2降序 */ORDER BY _column1 DESC, _column2 ; /* _column1降序，_column2升序 */ORDER BY _column1 DESC, _column2 DESC; /* _column1降序，_column2降序 */原文：https://www.cnblogs.com/wangcp-2014/p/13368603.html