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並前往https://docs.microsoft.com/zh-tw/office/vba/access/concepts/structured-query-language/group-by-clause-microsoft-access-sql

group by 子句(Microsoft Access SQL)

若在SELECT 陳述式中包含SQL 彙總函數，例如Sum 或Count，就會為每一筆記錄建立摘要值。 語法. 從[GROUP BY groupfieldlist ] 的__條件選取fieldlist.

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