Two methods for parsing database pagination compare of row_number of over of and top

  • 2020-05-27 07:21:55
  • OfStack

Today, the teacher took us to review 1 database pagination, in general, today feel good, because the previous learning has not forgotten. All right, to get to the point,
First, let's talk about the top method
The top method is essentially taking the number of pages that you want to look up and taking the number of pages that you want to look up
Ex. :

 1 page 3 The data   Take the first 1 Pages of data  
--  The first 1 page  
       select top 3 * from T_news;
                        Take the first 5 Pages of data 
-- The first 5 page 
       select  top 3 * from T_News where id not in (select top (3*4) id from T_News)      -- The point is not  in on   It's up to him to get rid of the first few pages 
                     If you want to set the number of data per page and the number of pages you look at, that's fine   Just add another stored procedure 
create proc usp_fenye @geshu int,@yeshu int 
as
 begin
   select top (@geshu) * from T_News where id not in (select top (@geshu*(@yeshu-1)) id from T_News)
 end

Then, let's talk about the ROW_NUMBER()over() method
So this is essentially adding another column to the table to determine what the number is
Ex. :

                       1 page 3 The data   Take the first 1 Pages of data 
   select * from (select *,ROW_NUMBER()over(order by id asc) as number from T_News ) as tb1 
     where number between 1 and 3;
 The first 5 Pages of data 
 select * from (select *,ROW_NUMBER()over(order by id asc) as number from T_News ) as tb1 
     where number between 3*4+1 and 3*5;
                        Set the number of data per page and the number of pages you look at 
create proc usp_fenye @geshu int,@yeshu int 
 as
   begin
     select * from (select *,ROW_NUMBER()over(order by id asc) as number from T_News ) as tb1 
     where number between  @geshu*(@yeshu-1)+1 and @geshu*@yeshu;
   end

That's it. That's my understanding. I hope I can help you

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