How can the Oracle rownum sorting statement be used?

In Oracle, you can use the ROWNUM function to sort query results. ROWNUM is a pseudocolumn in the Oracle database that represents the row number in a result set. Here is an example of using ROWNUM to sort query results.

SELECT * 
FROM (SELECT * 
      FROM 表名 
      ORDER BY 排序列) 
WHERE ROWNUM <= N;

In the above example, the query results are first sorted using a subquery, and then filtered using ROWNUM in the outer query to return only the top N rows. Note: If you need to sort in descending order, you can add the DESC keyword after the sorting column, for example: ORDER BY sorting column DESC.