Where to develop your SQL skills.

Why you need to learn SQL?
Because almost every application that developers are creating uses CRUD (Create, Read, Update, Delete) so I’m pretty sure that we will have a kind of database mechanism under the hood.
To test this you can easily use the frontend and user interface. But sometimes you want to create a larger group of test data to be visible in our application. Here comes the SQL! You can make all the fantastic modifications to your data using this language. Ok, but how to start?
One of the best resource if want to learn SQL for testing purposes is Select Start SQL.
The page gives you the possibility to write SQL code and execute it using the included database. Instantly you can observe the results. Detailed explanations are very helpful to understand each part. During each chapter, you have also the ability to answer different questions to check your current understanding.
In the last chapter, you have this near-real world scenario to complete. In SQL there is no one correct answer to solve problems but there, of course, can be simpler and much-complicated approaches.
A good understanding of SQL gives us a chance to use Data-Driven Testing or API testing which will be described a bit later.