SQL แบบง่ายๆ ตอน sql basics groupby

SQL แบบง่ายๆ ตอน sql basics groupby

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【SQL超入門講座】06.GROUP BY｜指定したカラムの値を基準にデータを集計する方法
【SQL超入門講座】06.GROUP BY｜指定したカラムの値を基準にデータを集計する方法
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