When brushing up on SQL—especially intricate concepts like subqueries, indexing, and window functions—I started using FullStackPrep.Dev’s SQL hub. It offers clear topic summaries, MCQs, and interview-style explanations all in one place.
Perfect for both quick revisions and deep learning: https://fullstackprep.dev/articles/webd/sql
https://fullstackprep.dev/
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