谁能告诉我这两个SQL语句有什么区别?

SELECT *
  FROM (SELECT T.*, ROWNUM ROWNUM_
          FROM (SELECT *
                  FROM T_LOG_INFO
                 WHERE 1 = 1) T
         WHERE ROWNUM <= 15510)
 WHERE ROWNUM_ > 15500​

SELECT *
  FROM (SELECT T.*, ROWNUM RN
          FROM T_LOG_INFO_BUSI T
         WHERE ROWNUM < 15510)
 WHERE RN >= 15500;

网上写分页包括hibernate自动分页都是采用上面的语句分页，这两句SQL区别在哪里？