HSHarpreet Singh Kapulainsingh-technical-blog.hashnode.dev·21h ago · 8 min readWhat an Index Actually Is (Once You Stop Calling It a Book Index)You've heard the analogy. An index is like the index at the back of a book. Or a phone book, sorted by last name. Look up "Smith," flip to the right page, done. No index? You'd read the whole book co00
HSHarpreet Singh Kapulainsingh-technical-blog.hashnode.dev·1d ago · 10 min readYour JOIN Isn't Slow Because of Syntax. It's Slow Because of Memory.You've probably seen the meme — two people arguing over JOIN ... ON vs JOIN ... USING like one of them is obviously wrong. Here's the version that started this one: ❌ "The wrong one" SELE00