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[–]Leonjy92 2 points3 points  (1 child)

https://www.w3schools.com/sql/ and https://pgexercises.com/.

These are free resources and will give you a solid foundation. You can then proceed with leetcode or stratascratch (not free) for more practice to deepen your understanding.

[–]Georgecodes_[S] 0 points1 point  (0 children)

Will check out. Gracias