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Oracle倒序排列有哪些技巧

小樊
128
2024-07-17 14:55:43
栏目: 云计算

  1. 使用ORDER BY子句:在查询中使用ORDER BY子句来对结果进行倒序排列。例如:SELECT * FROM table_name ORDER BY column_name DESC;

  2. 使用DESC关键字:在ORDER BY子句中使用DESC关键字来指定按照倒序排列排序。例如:SELECT * FROM table_name ORDER BY column_name DESC;

  3. 使用ROWNUM:利用ROWNUM来实现倒序排列。例如:SELECT * FROM (SELECT * FROM table_name ORDER BY column_name ASC) WHERE ROWNUM <= 10 ORDER BY column_name DESC;

  4. 使用窗口函数:利用窗口函数ROW_NUMBER()来实现倒序排列。例如:SELECT * FROM (SELECT *, ROW_NUMBER() OVER (ORDER BY column_name ASC) AS rn FROM table_name) WHERE rn <= 10 ORDER BY column_name DESC;

  5. 使用子查询:通过子查询先将结果倒序排列,然后再查询出需要的数据。例如:SELECT * FROM (SELECT * FROM table_name ORDER BY column_name DESC) WHERE ROWNUM <= 10;

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