A set operation in relational databases that extracts only the rows present in both of two tables. The two tables must have the same column structure, and the result contains only records that appear in both. It is one of the fundamental set operations alongside union (combining all rows) and difference (rows appearing in only one table).

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• 2020r02o #73関係データベースにおいて，表 A と表 B の積集合演算を実行した結果はどれか。 表 A | 品名 | 価格 | | --- | --- | | ガム | 10…