Oracle's paging method

1. 1. According to ROWID to divide <! --more-->  
2.    
3. select * from t_xiaoxi where rowid in(select rid from (select rownum rn,ridfrom(select rowid rid,cid from   
4. t_xiaoxi  orderby cid desc) where rownum<10000) where rn>9980)orderby cid desc;     
5.    
6. select * from t_xiaoxi where rowid in(select rid from (select rownum rn,ridfrom(select rowid rid,cid from  
7. t_xiaoxi  orderby cid desc) where rownum<10000) where rn>9980)orderby cid desc;    
8.    
9. Execution time 0.03 seconds  
10. 2. According to the analysis function  
11.    
12. select * from (select t.*,row_number() over(orderby cid desc) rk from t_xiaoxit) where rk<10000 and rk>9980;    
13.    
14. select * from (select t.*,row_number() over(orderby cid desc) rk from t_xiaoxit) where rk<10000 and rk>9980;   
15.    
16. Execution time 1.01 seconds  
17. 3. Divided by ROWNUM  
18.    
19. select * from(select t.*,rownum rn from(select * from t_xiaoxi orderby ciddesc) t where rownum<10000) where    
20. rn>9980;   
21.    
22. select * from(select t.*,rownum rn from(select * from t_xiaoxi orderby ciddesc) t where rownum<10000) where   
23. rn>9980;  
24.    
25. Execution time 0.1 seconds  
26. Where t_xiaoxi is the table name, cid is the key field of the table, take the 9981-9999th records sorted by CID in descending order, there are more than 70,000 records in the t_xiaoxi table  
27. Personally, I feel that 1 is the best, 3 is the second, and 2 is the worst