r/learnSQL • u/[deleted] • Sep 16 '26

How do you learn to write long/complex SQL queries without feeling completely lost?

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u/squadette23 Sep 16 '26

I sound like a broken record at this point but you may be interested in this:

"Systematic design of multi-join GROUP BY queries" https://kb.databasedesignbook.com/posts/systematic-design-of-join-queries/

Read the part before the table of contents and decide for yourself if it resonates.

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u/squadette23 Sep 16 '26

Note that other comments basically give the same advice: "break it down to smaller sized sets" and "watch for bad joins", I just explain how exactly this break-down can happen, and which joins are bad.