August 2024
Intermediate to advanced
392 pages
10h 4m
Japanese
Content preview from 達人に学ぶDB設計徹底指南書 第2版
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さて、お待たせしました。それでは、社員、会社、部署の三つのテーブルの関係
をER図で表現してみましょう。
まず、ER図でのテーブルの表現方法ですが、これはIE記法もIDEF1Xも同じ
で、図4-1のような四角形で表わします。
四角の中を横線で二つのスペースに区切っていますが、上のスペースは主キー属
性、下のスペースは非キー属性を記述する場所です（非キー属性は、数が多い場
合は代表的なものだけを記述します）。また、他のテーブルの主キーを参照する
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4-3
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