結合rownum進行高效數據篩選時,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;
這些方法可以幫助在使用rownum進行數據篩選時提高效率。