Skip to main content

Pagination with OFFSET and FETCH in SQL Server.

In the real world, we load the data on the front from the database one time and load it into memory via data table or in some other form (main table and other supported tables) and
then loop through individual records in Parallel For Each for better performance. However, in some cases, if the data load is huge,
we may end up having memory issues loading all the records on the front so weload each individual record inside the loop in SQL which could potentially affect the performance.

Example : 

 SELECT First_Name + ' ' + Last_Name FROM REgistration
ORDER BY First_Name OFFSET 10 ROWS FETCH NEXT 5 ROWS ONLY;

In this example, it will skip the first 10 rows and return the next 5 rows.

Limitations while Using OFFSET-FETCH

  • ORDER BY is mandatory to use OFFSET and FETCH clause.
  • OFFSET clause is mandatory with FETCH. You can never use, ORDER BY … FETCH.
  • TOP cannot be combined with OFFSET and FETCH in the same query expression.
  • The OFFSET/FETCH row count expression can be any arithmetic, constant, or parameter expression that will return an integer value. The row count expression does not support scalar sub-queries.
Labels:
Location: London, UK

Comments

Post a Comment

Popular posts from this blog

How To See Logs Of Dropped Tables From The Database in MS SQL.

Here, I will explain you how you can see logs of users. Step 1 : First, create a new database with name "test". Step 2 : Create a new table. Step 3 : Now, go and drop the table by running the following command. Step 4 : Now, select your database under Object Explorer and go to Reports >> Standard Reports >> Schema Changes History. Step 5 : You will then see the schema change history. The report will show you who has dropped this table. Finally, you can locate the user activity with the help of log.
Post a Comment
Read more

How To Deploy .net Core Application On Linux

Here, I can explain steps to deploy .net core application on linux machine. Step 1 - Publish your .net Core application: First, create a .net core application on VS; you can make an MVC project or Web API project and if you already have an existing project, then open it. Right Click on your project Click on publish Now create a new publish profile, and browse the folder where you want to publish your project dll Click on publish so it will create your dll in the folder Step 2 - Install required .net Module on Linux: Now we have our web application dll and now we need to host it on the Linux environment. First, we need to understand how the deployment works in Linux. .Net applications run on Kestrel servers and we run Apache or Nginx server in Linux environments, which acts as a proxy server and handles the traffic from outside the machine and redirects it to the Kestrel server so we will have Apache or Nginx server as the middle layer. In this article, we will use Apache as a proxy ser
Post a Comment
Read more

List Of Commonly Used Angular Commands

1) To get the npm version,    npm -v 2) To get the node version,    node -v 3) To get the Angular version,    ng v  4) To get the Jasmine version,    jasmine -v  5) To get the Karma version,    karma --version  6) To install Angular CLI,    npm install @angular/cli -g   npm install @angular/cli 7) To install the next version of Angular CLI, v   npm install @angular/cli@next  8) To get help in the terminal,    ng help 9) To create a new project in Angular,    ng new project-name  10) To skip external dependencies while creating a new project,    ng new project-name --skip-install  11) To run the Angular project,   ng serve (or) npm start (or) ng serve --force  12) Dry Run,   ng new project-name --dry-run 13) To create a new component in the Angular Project,   ng generate component component-
Post a Comment
Read more