SQL-ORDER BY 多字段排序(升序、降序)
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 */

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