Message in Japanese (日本語)
HAVING 句または選択リストに含まれるサブクエリの場合、および集計される列が外部参照の場合にだけ、ON 句に集計を含めることができます。
Unlocalized message
An aggregate cannot appear in an ON clause unless it is in a subquery contained in a HAVING clause or select list, and the column being aggregated is an outer reference.
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