结合rownum进行高效数据筛选时，可以使用以下方法：
SELECT * FROM (
SELECT * FROM table_name ORDER BY column_name
) WHERE ROWNUM <= 10;
SELECT * FROM table_name WHERE ROWNUM <= 10;
SELECT * FROM (
SELECT rownum AS rn, t.* FROM table_name t
) WHERE rn BETWEEN 1 AND 10;
这些方法可以帮助在使用rownum进行数据筛选时提高效率。
