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Oracle倒序排列有哪些技巧

小樊
107
2024-07-17 14:55:43
欄目: 云計算

  1. 使用ORDER BY子句：在查詢中使用ORDER BY子句來對結(jié)果進(jìn)行倒序排列。例如：SELECT * FROM table_name ORDER BY column_name DESC;

  2. 使用DESC關(guān)鍵字：在ORDER BY子句中使用DESC關(guān)鍵字來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來實(shí)現(xiàn)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. 使用窗口函數(shù)：利用窗口函數(shù)ROW_NUMBER()來實(shí)現(xiàn)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. 使用子查詢：通過子查詢先將結(jié)果倒序排列，然后再查詢出需要的數(shù)據(jù)。例如：SELECT * FROM (SELECT * FROM table_name ORDER BY column_name DESC) WHERE ROWNUM <= 10;

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