【Oracle】取得Top n条记录

方法1：利用ROW_NUMBER函数

SELECT  NO  FROM  (
     SELECT  ROW_NUMBER()  OVER  ( ORDER   BY  NO) RNO, NO  FROM  ROWNUM_TEST
)
WHERE  RNO  <=   5
ORDER   BY  NO ;

取出中间 n 条记录

SELECT  NO  FROM  (
     SELECT  ROW_NUMBER()  OVER  ( ORDER   BY  NO) RNO, NO  FROM  ROWNUM_TEST
)
WHERE  RNO  BETWEEN   5   AND   10
ORDER   BY  NO;

方法2：利用子查询

SELECT  NO  FROM  (
     SELECT  NO  FROM  ROWNUM_TEST
     ORDER   BY  NO
)
WHERE  ROWNUM  <=   5
ORDER   BY  NO ;

取出中间 n 条记录

SELECT  NO   FROM  (
     SELECT  NO, ROWNUM RNO  FROM  (
         SELECT  NO  FROM  ROWNUM_TEST
         ORDER   BY  NO
    )
)  WHERE  RNO  BETWEEN   5   AND   10
ORDER   BY  NO;