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  • SQL COUNT GROUP BY
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並前往https://www.jooq.org/doc/latest/manual/sql-building/sql-statements/select-statement/group-by-clause/

GROUP BY clause - jOOQ

SELECT AUTHOR_ID, COUNT(*) FROM BOOK GROUP BY AUTHOR_ID ... Note, as defined in the SQL standard, when grouping, you may no longer project any columns that ...

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