If you build applications with databases, build databases or work with databases, you will really enjoy Sequel Pro. It is a GUI MySQL Database Manager for OSX that really streamlines the amount of time you would normally spend tinkering around in command line.
You connect directly into your database via port 3306 or SSH, and from there its like working with an Excel spreadsheet. You can create tables on the fly, edit data, add columns, export .sql dumps, you name it.
I personally save an enormous amount of time using this software, as opposed to traditional command line MySQL. If you have a Mac, and you work with MySQL, then you need this: