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並前往https://academy.vertabelo.com/course/postgresql-group-by-extensions/rollup/group-by-recap/grouping-by-multiple-columns

GROUP BY Extensions in PostgreSQL | Online Course

Learn PostgreSQL GROUP BY extensions: ROLLUP, CUBE, GROUPING SETS. ... category, AVG(score) AS avg_score FROM contest_score GROUP BY full_name, category;.

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