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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3
第 章
第 1 正規形。理由は演習 3-2の解答を参照してください。
まず、以下の部分関数従属が存在します。
次に、以下の推移的関数従属が存在します。
部分関数従属が存在することから、この「支社支店商品」テーブルは、第2正規
形を満たしていません。しかし、すべてのセルがスカラ値によって構成されている
ことから、第1 正規形は満たしています。
三つの部分関数従属を解消するために、次のような三つのテーブルを作ることが
できます。
338
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8
7
6
5
4
3
2
1
001 東京
002 大阪
001 石鹸 C1
002 タオル C1
003 ハブラシ C1
004 コップ C1
005 箸 C2
006 スプーン C2
007 雑誌 C3
008 爪切り C4
001 01 渋谷
001 02 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.