SQL Fiddle | A tool for easy online testing and sharing of database problems and their solutions.

Via [WayBack] SQL select only rows with max value on a column, I bumped into http://sqlfiddle.com/#!9/a6c585/1:

Application for testing and sharing SQL queries.

Source: [WayBack] SQL Fiddle | A tool for easy online testing and sharing of database problems and their solutions.

It is a cool site, currently supporting these SQL back-ends:

• MySQL 5.6
• Oracle 11g R2
• PostgreSQL 9.6
• PostgreSQL 9.3
• SQLite (WebSQL)
• SQLite (SQL.js)
• MS SQL Server 2014

You can host it yourself using [WayBack] GitHub – zzzprojects/sqlfiddle2: New version of SQL Fiddle based on OpenIDM (in the past it was [WayBack] GitHub – zzzprojects/sqlfiddle)

Other resources for learning and playing around with SQL:

• [Archive.is] Is there a site for online SQL server practice? – Quora
• [WayBack] Oracle Live SQL via [WayBack] A Place to Learn Oracle, No Setup Required | ThatJeffSmith
• [WayBack] Online Sqlite Compiler – Online Sqlite Editor – Online Sqlite IDE – Sqlite Coding Online – Practice Sqlite Online – Execute Sqlite Online – Compile Sqlite Online – Run Sqlite Online
• [Archive.is] Is there a site for online SQL practice, besides sqltest.net? – Quora
• [WayBack] SQL Tryit Editor v1.6
• [Archive.is] Is there a public SQL database that can be used to practice SQL querying on? – Quora

–jeroen