切换主题
SELECT column_1, column_2, column_3, ... FROM table_name ORDER BY column_1 [ASC | DESC] [NULLS FIRST | NULLS LAST], column_1 [ASC | DESC] [NULLS FIRST | NULLS LAST],
用于对一列或多列的查询结果集按照降序或升序进行排序操作
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