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ORACLE分頁SQL語句

一個非常好的ORACLE的分頁SQL語句 

select * from (select my_table.*, rownum as my_rownum from ( select yhbh, yhmc from yysf_tb_yonghxx order by yhbh) my_table where rownum <20 ) where my_rownum>=10

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其它幾種分頁實現:

1.根據ROWID來分
select * from t_xiaoxi where rowid in(select rid from (select rownum rn,rid from(select rowid rid,cid from

t_xiaoxi  order by cid desc) where rownum<10000) where rn>9980) order by cid desc;
執行時間0.03秒
2.按分析函式來分
select * from (select t.*,row_number() over(order by cid desc) rk from t_xiaoxi t) where rk<10000 and rk>9980;
執行時間1.01秒
3.按ROWNUM來分
select * from(select t.*,rownum rn from(select * from t_xiaoxi order by cid desc) t where rownum<10000) where

rn>9980;執行時間0.1秒
其中t_xiaoxi為表名稱,cid為表的關鍵欄位,取按CID降序排序後的第9981-9999條記錄,t_xiaoxi表有70000多條記錄
個人感覺1的效率最好,3次之,2最差

 oracle如何返回指定行數之間的查詢結果

如何返回指定行數之間的查詢結果,以實現web記錄分頁,在Oracle中有許多的方法,這裡僅僅列出了4種,希望能對大家有所幫助,大家可以根據不同需要選擇下面的script 
  
  1)select ... where rownum < 50 minus select ... where rownum < 30  
    這個方法因為用到了minus操作符,所以速度會受影響。  
  2) 
  SELECT results.* FROM  
  ( SELECT t2.*, rownum rownumber FROM  
  ( SELECT t.* FROM mv_table t WHERE ORDER BY col1) t2) results  
  WHERE results.rownumber BETWEEN 30 and 50 ORDER BY col1 
  這個方法是從一個論壇上看到的,沒有親自測試過  
  3) 
  定義cursor x, 2.fetch x a,b,c; loop ...... end loop;  
  其中用兩個迴圈變數和一個FLAG變數,分別表示,當前的記錄數,屬於第幾頁的, 及第一頁面。  
  ps;  
  j:=to_number(kafyf);  
  i:=1;  
  open cx;  
  loop fetch cx into col1,col2,col3,col4,col5,col6;  
  if cx%NOTFOUND then exit; end if;  
    if i>=j then  
  htp.tableRowOpen;  
  htp.tableData(col1);  
  htp.tableData(col2);  
  htp.tableData(col4);  
  htp.tableData(col5);  
  htp.tableData(col6);  
  htp.tableData(col3);  
  htp.tableRowClose;  
  i:=i+1;  
  if i=j+10 then l:=1; exit; end if;  
  else i:=i+1;  
  end if;  
  end loop;  
  close x;  
  該方法是名叫‘淼’的網友寫的script,他用到了Oracle web2kit中的OWA_UTIL package。 
  
  4)How can one page forward and backwards through a table? 
  Externalize ROWNUM by implementing queries like this:  
  
  SELECT ...  
  FROM (SELECT ROWNUM rnum, ... FROM ...)  
  WHERE rnum BETWEEN :low AND :high AND rownum <(:high :low + 1);  
    where :low and :high are dynamically generated values depending on which result page the user 
  is viewing. Typically, they are used to show "Next 15 matches", "Previous 15 matches" links at the 
  bottom of each page.