Is Hackerrank Good for Sql?

You've probably heard of HackerRank before, so it should be no surprise to you that they have one of the best collections of SQL practice challenges around.

How many SQL problems are there on HackerRank?

It took me a bit more than two weeks (on and off between work, workout, and taking the kid to day school, etc.) to finish all the 58 SQL challenges on the site, and I gained quite some insights from the journey (and having quite some fun doing that!).

Is it good to practice HackerRank?

Yes, HackerRank is a great resource if you're seeking to polish your coding skills. It has a robust free version, verified solutions you can check at any time (a useful feature that LeetCode lacks), and a wide array of programming questions for you to solve.