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Took a free SQL quiz on a whim, turns out my whole join logic was backwards

I've been self-teaching via YouTube for like 8 months and felt pretty solid, but this random quiz site from a Reddit comment had a 10 question section on JOINs. I got 3/10 and one of the explanations literally said 'you're filtering before joining, that's why your results look weird.' Has anyone else found those tiny free quizzes expose gaps you didn't even know you had?
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webb.val
webb.val9d ago
Pfft, 8 months of YouTube and you're sweating a random 10 question quiz? That's nothing. Those little tests are designed to trip you up with edge cases that nobody hits in real life unless you're building some weird reporting dashboard at 2am. I bet you still know more than half the people who claim to "know SQL" on their resume. Fix the filter thing, move on, and don't let a free quiz ruin your whole week lol.
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