Let's SQL

Lets SQL is an iPhone app on which you can type and run SQL statement including both DDL and DML.
Not only you can learn SQL with excellent exercises but also you can try your own SQL on this application anytime, anywhere.
You can add databases and objects on them, which means you can try some special functions or complex statements using this practical structure just like in the real world.
If you are a Dropbox(TM) user, you can import your tables into any databases on the app from the Dropbox storage.