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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
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第 章
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
●リレーショナルデータベースにおけるテーブルとは、「同じ種類の物の
集合」のことです。
●「キー」とは、ある情報を引き出すための鍵です。特に、テーブルで最
も重要なのが「主キー」です。
●「正規化」は、データの冗長性をなくしていく作業です。その目的は更
新時のデータ不整合を防止することにあります。
●正規化を理解するためには、関数従属の概念を理解する必要がありま
すが、これの基礎になっているのが「キー」の概念です。
●正規化を進めていくほどデータ整合性は高まりますが、検索性能が劣
化します。通常は第3正規形までを考えれば十分です。
3
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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.