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explaining sql levels based on one meme

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Added explanation for fsyncgate and "Every SQL operator is actually a JOIN"

Add link to helpful post articulating join ordering and NP hardness

Link to N+1 SO as explanation for bad ORM queries

Added explanations in the commit messages, but most are self explanatory if you click through. If it's not clear: Learned Indexes appear to be a theoretical index, that hasn't been...

Added links to the following items: - [ ] ORMs create bad queries. - [ ] Optimizers don't work without table statistics.