Nothing is burning when you play this fiddle... SQLFiddle, the quickest way for play SQL Server, MySQL, Oracle, PostgreSQL statements

SQLFiddle.com

SQL Fiddle is a tool for database developers to test out their SQL queries. If you do not know SQL or basic database concepts, this site is not going to be very useful to you. However, if you are a database developer, there are a few different use-cases of SQL Fiddle intended for you:

• You want help with a tricky query, and you'd like to post a question to a Q/A site like StackOverflow. Build a representative database (schema and data) and post a link to it in your question. Unique URLs for each database (and each query) will be generated as you use the site; just copy and paste the URL that you want to share, and it will be available for anyone who wants to take a look. They will then be able to use your DDL and your SQL as a starting point for answering your question. When they have something they'd like to share with you, they can then send you a link back to their query.
• You want to compare and contrast SQL statements in different database backends. SQLFiddle easily lets you switch which database provider (MySQL, PostgreSQL, MS SQL Server, and Oracle) your queries run against. This will allow you to quickly evaluate query porting efforts, or language options available in each environment.
• You do not have a particular database platform readily available, but you would like to see what a given query would look like in that environment. Using SQL Fiddle, you don't need to bother spinning up a whole installation for your evaluation; just create your database and queries here!

How does it work?

The Schema DDL that is provided is used to generate a private database on the fly. If anything is changed in your DDL (even a single space!), then you will be prompted to generate a new schema and will be operating in a new database.

All SQL queries are run within a transaction that gets immediately rolled-back after the SQL executes. This is so that the underlying database structure does not change from query to query, which makes it possible to share anonymously online with any number of users (each of whom may be writing queries in the same shared database, potentially modifying the structure and thus -- if not for the rollback -- each other's results).

As you create schemas and write queries, unique URLs that refer to your particular schema and query will be visible in your address bar. You can share these with anyone, and they will be able to see what you've done so far. You will also be able to use your normal browser functions like 'back', 'forward', and 'reload', and you will see the various stages of your work, as you would expect.

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I thought this a pretty darn cool site. Looks like the by far easiest way to play with some simple SQL statements. I dig also how it supports those four different server types and chromo keying.

(via Teusje - SQL Fiddle: a tool for database developers)