sql根据多字段排序,mysql动态多字段排序

转载自：http://www.jb51.net/article/52792.htm

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 */