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An AI explained SQL GROUP BY in four lines. One of them is wrong.

This story is from 2026-10-16. It is preserved in the archive; the latest stories are on the live feed.

We asked Aria, our AI, how filtering works with GROUP BY. She answered in four lines and sounded completely sure about all of them: 1. WHERE filters rows before they are grouped. 2. HAVING filters the groups after GROUP BY runs. 3. COUNT(*) counts every row in a group, NULLs included. 4. So WHERE C…

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  1. 2026-10-16 09:14 · DEV Community — AI
    An AI explained SQL GROUP BY in four lines. One of them is wrong.

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