select * from (select ROWNUM r, s.* from LJBUSAMOUNT s WHERE ROWNUM <=10) where r>= 1
select * from (select ROWNUM r, s.* from LJBUSAMOUNT s WHERE ROWNUM <= 20) where r>=11
select * from (select ROWNUM r, s.* from LJBUSAMOUNT s WHERE ROWNUM <= 30) where r>=21
总行数 = select count(*) from LJBUSAMOUNT
总页数=总行数/每页数量
如果有小数则
总页数=到整数(总页数)
总页数=总页数+1