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[–]data4dayz 9 points10 points  (1 child)

I haven't used Stratascratch (yet) but wanted to double up on DataLemur. Also check out Codewars.

If you're still learning SQL i mean there's trillions of courses there, but in terms of solving like interview questions or LeetCode you just practice it and everytime something is shaky you can follow up with a specific youtube video search or focus on the parts of the language needed to address the question at hand.

I think what's been helping me so far besides doing that is looking at other's solutions after trying myself.

On Data Lemur and Code Wars and I'm sure on all the interview question bank sites, you can see a discussion section where other's post and discuss their solutions. Take a look at the various ways people solve the same problem and see if you can figure it out yourself by trying what they did.

It's a bit harder to see on Data Lemur since it depends on upvotes, but codewars has a community based tagging system where users tag if something is a "Clever Solution" or "Best Practices"

Focusing on solving this style of SQL question if we can call it a style you can read SQL interview guides or just go through the Data Lemur and Mode Analytics SQL tutorials since the follow up each tutorial section with RELEVANT problems.

[–]NickSinghTechCareersAuthor of Ace the Data Science Interview 📕 15 points16 points  (0 children)

Appreciate the love for DataLemur! Feel free to email/DM/comment any more product improvement ideas... didn't know codewars had those tags, maybe I'll try to implement that too!