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並前往https://intellipaat.com/community/10872/grouped-limit-in-postgresql-show-the-first-n-rows-for-each-group

Grouped LIMIT in PostgreSQL: show the first N ... - Intellipaat

For PostgreSQL 8.4, You can use the below code: SELECT *. FROM (SELECT ROW_NUMBER() OVER (PARTITION BY section_id ORDER BY name) AS r,t.

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