Optimal ms SQL server paging SQL statements

 

Author: yanek
Email: yanek@126.com

Feature: only one page of data is returned for a single query. Instead of getting all the data.
Note:

Pagesize: number of records displayed per page
Cureentpage: Current page number

Select * from (select TOP pagesize * FROM (select top pagesize * cureentpage * from user_table order by id ASC) as aSysTable order by id DESC) as bSysTable order by id ASC

Example:

Assume that the database table is as follows:

User_table:

Id: primary key, auto-Increment
Username: character
Password: character

Assume there are 80 records, and 10 records are displayed on each page, with IDs ranging from 1 to 80.

Now the data on the third page is sorted in ascending order by id: The obtained Record id should be 21 to 30.

The statement should be:

Select * from (select TOP 10 * FROM (select top 30 * from user_table order by id ASC) as aSysTable order by id DESC) as bSysTable order by id ASC

The principle is as follows:

First, 30 records (3*10) are retrieved in ascending ORDER of IDS, that is, records with IDs between 1 and 30 (select top 30 * from user_table order by id ASC)

Then sort the 30 records in descending order by ID.

Then, extract the first 10 records from the 30 records: The obtained records are: IDs are between 30 and 21. This is the data we need, but it is arranged in descending order and does not meet the requirements.

Finally, the data we need will be obtained after re-sorting. The id is between and 30.

Hope to help you.

If you have any questions, I hope to share them with you.