May 2020
Intermediate to advanced
456 pages
9h 13m
Japanese
Content preview from ゼロからはじめるデータサイエンス 第2版 ―Pythonで学ぶ基本と実践
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384
■
24
章 データベースと
SQL
24.11
NoSQL
データベースに関する最近の流行は、データを表として表現しない非関係データ
ベースである「
NoSQL
」で す 。 例 え ば 、
MongoDB
はスキーマを持たない人気のある
データベースであり、データ要素を行ではなく任意の
JSON
データとして表現します。
列指向データベースはデータを行単位ではなく列単位で格納します（列を大量に持
つけれども検索対象とするのはそのうちの一部のみである場合に有効です）。キーバ
リューストアはキーに対して
1
つの（複雑な）値の取り出しに特化しています。グラフ
の格納とグラフ内の探索を行うデータベースもあります。複数のデータセンターにま
たがった環境に最適化されたデータベースや、メモリ上のデータを扱うデータベース、
時系列を扱うために作られたデータベースなど、非常に多くのデータベースが登場し
ています。
未来のことは誰にもわかりません。
NoSQL
が今後重要となる以上のことを今は言え
ませんが、その知識自体が、現時点では重要なのです。
24.12
さらなる探求のために
●
リレーショナルデータベースを使ってみたいのなら、コンパクトで高速な
SQLite
（
https://www.sqlite.org/index.html
）か 、よ り 多 機 能 な
MySQL
（
http://www.
mysql.com
）も し く は
PostgreSQL
（
https://www.postgresql.org/
）が 候 補 と な る で
しょう ...
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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.Julian F.
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.
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.Amir M.
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.