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SQL has levels to it: - level 1 SELECT, FROM, WHERE, GROUP BY, HAVING, LIMIT Master these basic keywords and you’ll be well on your way to mastering SQL. - level 2 Mastering JOINs: Most common JOINs: INNER and LEFT Less common JOINs: FULL OUTER Joins you should avoid... show more
34,758 次观看 • 5 个月前 •via X (Twitter)
32 条评论

Good breakdown. A few important gaps you didn’t include: * Data modeling (star schema, fact vs dimension tables) * Query design thinking (business question → schema → query plan) * Handling messy data (NULL logic, duplicates, bad joins) * Time intelligence (running totals, lag/lead over time series) * Performance habits (avoiding SELECT *, reducing joins early) Level 4 is also missing the real interview skill: writing correct business queries from scratch under ambiguity.

It might not be as important now, but LLMs will have a hard time figuring out what you need if you don’t know how to ask for the correct query

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all things I can look up when I need them. SQL is a basic logic puzzle. If you understand logic and programming, spend half a day with a good text and you'll get it.

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Help yourself and remove that lint from your mic foam

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Indexed our sql db check out the speed great video

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@ebukagaus SQL

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Premium insights Thanks for sharing great man
