oracle分頁查詢

oracle分頁查詢

1、表 student

id  name  create_time

01  dong  2014-03-03 12:13:14

02  xiao  2014-03-04 12:13:14

03  wang  2014-03-05 12:13:14

2、基礎查詢語句

select id, name, create_time 

from student 
where create_time > to_date('2014-03-02 12:13:14', 'yyyy-mm-dd hh24:mi:ss') 
order by create_time

3、查詢總條數sql語句

select count(*) from (基礎查詢語句)

4、分頁查詢sql語句（效率高）

select * from 

(  select ta.*, rownum rn from (基礎查詢語句) ta 
where rownum <= (page_num * one_page_size)
) tb 
where tb.rn > ((page_num-1) * one_page_size )

//此種方法查詢效率較高

5、分頁查詢sql語句（效率低）

select * from 

(  select ta.*, rownum rn from (基礎查詢語句) ta 
) tb 
where tb.rn > ((page_num-1) * one_page_size ) 
and   tb.rn <= (page_num * one_page_size)

//此種方法查詢效率較低

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