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A Visual Explanation of SQL Joins
11 Oct 2007 A Visual Explanation of SQL Joins I thought Ligaya Turmelle's post on SQL joins was a great primer for novice developers. Since SQL joins appear to be set-based, the use of Venn diagrams to explain them seems, at first blush, to be a natural fit. However, like the commenters to her post, I found that the Venn diagrams didn't quite match the SQL join syntax reality in my testing. I love
GitHub - ntalbott/query_trace: Adds query origin tracing to your logs.
= QueryTrace plugin for Rails It's nice that ActiveRecord logs the queries that are performed when your actions are executed, since it makes it easy to see when you have serious inefficiencies in your application. The next question, though, is always, "OK, so where are those being run from?" Before QueryTrace, that question could be a real pain to answer, since you'd have to go trawling through yo
DB設計の神ツール「ERMaster」なら、ここまでできる
DB設計の神ツール「ERMaster」なら、ここまでできる：ユカイ、ツーカイ、カイハツ環境！（11）（1/3 ページ） 無料のEclipseプラグイン「ERMaster」とは データベースのテーブル設計を行うときに皆さんは、どのようにしているでしょうか？ いくつかの無料で利用できるツールが提供されているので、筆者はそれらを利用していましたが、最近「ERMaster」と呼ばれるEclipseプラグインの存在を知りました。 ERMasterは、ほかのツールに比べ、直感的で分かりやすいUI（ユーザーインターフェイス）に、カスタマイズ可能な、Excelで出力できるテーブル定義書、辞書機能など痒いところに手が届くERモデリングのツールです。本稿では、このERMasterについてご紹介します。 ERMasterの主な特徴、8つ ERMasterには、主に次のような特徴があります。 【1】直感的で使いや
Amazon Relational Database Service (Amazon RDS)
Amazon Relational Database Service Easy to manage relational databases optimized for total cost of ownership Amazon Relational Database Service (Amazon RDS) is an easy-to-manage relational database service optimized for total cost of ownership. It is simple to set up, operate, and scale with demand. Amazon RDS automates the undifferentiated database management tasks, such as provisioning, configur
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Apache CouchDB
Data Where You Need It Apache CouchDB ™ lets you access your data where you need it. The Couch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment from globally distributed server-clusters, over mobile phones to web browsers. Store your data safely, on your own servers, or with any leading cloud provider. Your web- and native a
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GitHub - twitter-archive/gizzard: [Archived] A flexible sharding framework for creating eventually-consistent distributed datastores![GitHub - twitter-archive/gizzard: [Archived] A flexible sharding framework for creating eventually-consistent distributed datastores](https://cdn-ak-scissors.b.st-hatena.com/image/square/2db2051dcceeb069e3f99113b5c4df2bd582bd9f/height=288;version=1;width=512/https%3A%2F%2Fopengraph.githubassets.com%2Fa47bf8ff854e29b84d4885718b5bc0c9d061a6f5ae3f09346bd98dbadd3da437%2Ftwitter-archive%2Fgizzard)
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