Detailed sorting of Oracle and MySQL pages

Database Paging SQL sentence ：
I don't say much nonsense , Go straight to the code ,Orcle and Mysql Paging formula for

    ①：MySQL Pagination ,select * from emp limit m,n;(m Indicates the starting index of the query data ,n Indicated from m+1 strip   Inquire about n strip )
      1. Paging requirements    each page 3 strip , Query the first 2 page 
        page  = 2;
        pageSize =3;

       2. The formula 
         Starting index 
        startIndex = (page-1)*pageSize
         Maximum number per page 
        maxCount = pageSize;
        
       3.sql example 
         select * from emp limit satrtIndex,maxCount;

     ②：Orcle Pagination 
       1. Paging requirements    each page 3 strip , Query the first 2 page 
         page  =2;
         pageSize  =3;

       2. The formula 
          Start line number 
         startRownum = (page-1)*pageSize+1;
          End line number 
         endRownum = page*pageSize;
        
       3.sql example 
         select * from (select rownum r,t.* from emp t where rownum <=6) where r>=4; 
         select * from (select rownum r,t.* from emp t where rownum <=endRownum ) where r>=startRownum ; 

     ③： Summarize paging again ：
        1.MySQL： use limit keyword 
        2.Orcle: use rownum Line number to page