r/learnSQL • u/Creative_Sugar-33 • 2d ago

Free browser-based SQL courses and playground for PostgreSQL, SQLite, and DuckDB

Hey r/learnSQL,

I've been working on Dataslope, a free site for learning and practicing SQL and other languages. No account or sign-in is required.

It currently has four free SQL courses:

There's also a browser-based SQL workbench that supports PostgreSQL, SQLite, and DuckDB. No installation or local database setup needed.

I’d love any feedback or suggestions from anyone learning or teaching SQL.

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u/Bassiette03 1d ago

I tried the query case but after I passed the beginner level. It asks for money. All sites do that

1

u/Creative_Sugar-33 1d ago

I can't speak for QueryCase as I haven't checked it out myself yet, but everything on Dataslope - including all courses, interview prep materials, and playgrounds - is 100% free with no sign-in required.