Merge pull request #1932 from rozhnev/master

Update README.md

README.md

@@ -139,6 +139,7 @@ When learning CS, there are some useful sites you must know to get always inform
 - [Udemy](https://www.udemy.com/) : Whether you want to learn or to share what you know, you’ve come to the right place. As a global destination for online learning, we connect people through knowledge.
 - [Scaler](https://www.scaler.com/topics/) : A curated interactive space for aspiring programmers to learn and master their coding skills. Also help in job interview.
 - [SQL Zoo](https://sqlzoo.net/wiki/SQL_Tutorial) : Learn SQL interactively in stages, from basic queries to complex operations.
+- [SQLTest.online](https://sqltest.online) : Boost Your SQL Proficiency with Challenging Problems.
 
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