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What is a data lake in basic terms?
today I choose violence

Thought this was interesting. Across 160 teams of researchers, just about all failed to make good life outcome predictions on things like GPA, evictions, layoffs, and others. Data followed 4.5k families across 15 years, with 13k features (varied over time). Haven't looked at it directly yet, but will be turning the docs and data inside out... In the meantime, authors claim this as showing the limits of ML. Oh, and it's published in PNAS, so you know there's some big publication energy there.
https://www.pnas.org/content/117/15/8398
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Coursera
+1 for leetcode.
Another option, if you want to play around by trying to build some project (which I think is the best way to learn) would be to use a free sql database (eg MySQL, Postgres).
Don’t watch videos, unless you’re trying to learn some concept. You need hands on experience actually writing sql to become good at it.
SQLFiddle is good for writing queries without having to have access to a database
Leetcode is actually really good, I’ve learned a ton of tricks from that
How do the difficulty of SQL Leetcode questions compare with interviews? I found the SQL Leetcode questions (even Hards) to be surprisingly very easy compared to leetcode coding questions.
There is this platform called learnsql.com
Cortex AI Data Services
Def need to know this too I need to brush up on my SQL
Sqlzoo.net
You can submit sql code right in the website and play around without much set up.
Also can download the community version of MySQL
Datacamp.com has some really solid courses for beginners.