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Basics of Querying

    Understanding the Foundations Standard SQL is based on the relational model, which is a mathematical model for data management and manipulation. The relational model was initially created and proposed by Edgar F. Codd in 1969. Since then, it has been explained and developed by Chris Date, Hugh Darwen, and others. the true source for the model’s name is the mathematical concept relation. A relation in the relational model is what SQL calls a table. The two are not synonymous. SQL attempts to represent with a table: a relation has a heading and a body. The heading is a set of attributes (what SQL attempts to represent with columns), each of a given type. An attribute is identified by name and type name. The body is a set of tuples (what SQL attempts to represent with rows). Each tuple’s heading is the heading of the relation. Each value of each tuple’s attribute is of its respective type.  Some of the most important principals to understand about SQL stem from the relational
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What Is Playwright?

 Playwright is a powerful testing tool that provides reliable end-to-end and cross-browser testing for modern web applications.




Developed by Microsoft, Playwright is a Node.js library that automates Chromium, Firefox, and WebKit with a single API. Developers writing JavaScript code can use these APIs to create new browser pages, navigate to URLs, and manipulate elements on the page. Because Microsoft Edge is built on the Chromium open source web platform, Playwright can also automate Microsoft Edge. Playwright end-to-end testing is slowly gaining popularity. Many developers consider it one of their favorite frameworks. The current state of the developer JS survey shows that while Cypress adoption is on the rise, Playwright adoption is still in the early stages of development. However, according to GitHub stats, Playwright's popularity is growing (49.2k stars and 2.4k forks).


Playwright launches a headless browser by default. Playwright launches a headless browser by default. The command line is the only way to use a headless browser as it doesn't display a user interface. Playwright also supports running Microsoft Edge (not headless).


Playwright is recommended if you have coding experience and have a website that you would like to assess for browser compatibility. Playwright allows you to create new browser pages and keep multiple tabs open, with a browser context or environment in which relevant documents are displayed to the user. In addition to Playwright's versatility, this framework gives you the freedom to manipulate elements on your web pages to maximize your productivity. Playwright also creates its own URL so you don't have to spend your precious time creating it yourself.


Does Playwright Require JavaScript?

If you choose Playwright, remember that JavaScript plays an important role in using the API. Developers must write JavaScript code to set up new browser pages and add or edit page content. In addition, Playwright is more suitable for experienced web developers, as URLs containing JavaScript code can be difficult to navigate if you are new to the framework. Before using this framework for your automation needs, you may need to spend some time honing your JavaScript code skills and familiarizing yourself with the system. JavaScript isn't the only programming language Playwright uses, but it's the most popular programming language for web development. Therefore, many developers already have experience programming in JavaScript and use this language when setting up their frameworks. However, Playwright is equally efficient when working with various high-level programming languages ​​such as Python and C#.



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