【ipa】075 ER 図・関係スキーマ・主キー/外部キー — "町内会の名簿と回覧板" で一発理解

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🎓 シリーズ: ipa (情報処理安全確保支援士) 本日のテーマ: ER 図・関係スキーマ・主キー/外部キー — "町内会の名簿と回覧板" で一発理解基本情報技術者 (FE) の DB 設計の入口。「町内会の名簿と回覧板」のたとえで、エンティティ・主キー・外部キー・候補キー・1対多リレーションが一生忘れない論点に変わります。ER 図 (IE 記法) と過去問解説つき。 📚 Web 記事: https://ipa.nagara-study.com/fe/09_db/02-er-keys.html 🎓 シリーズ全話: https://nagara-study.com/series/ipa/

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【ipa】075 ER 図・関係スキーマ・主キー/外部キー — "町内会の名簿と回覧板" で一発理解

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