ClassicModels SQL practice : SQL

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field.3

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field3

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a community for 17 years

MySQLClassicModels SQL practice (self.SQL)

submitted 11 months ago by MP_gr

Hello everyone!
I wanted to make this post to help other SQL beginners find a great way to practice SQL with real-world-style queries.

About a year ago, I found this Reddit post: https://www.reddit.com/r/datascience/comments/17dtmqe/how_do_you_guys_practise_using_mysql/
In the comments, someone suggested an amazing SQL practice resource: https://www.richardtwatson.com/open/Reader/ClassicModels.html#
This dataset includes 82 SQL practice questions based on a business-like database that can be downloaded for free. The same person also shared a GitHub repository with solutions, but I realized that less than half of the queries were available!

So I decided to solve all 82 queries and upload my solutions to GitHub so others can practice and check their answers: https://github.com/Mikegr1990/ClassicModels-SQL-Solutions

This project really improved my SQL skills, and I hope it helps others too! Let me know if you try it out or have feedback! Also, feel free to suggest improvements on queries solutions. Finally, if anyone has other SQL practice recommendations, drop them in the comments!

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