Oracle 10g Express Edition
SQL Server Express
- Download Please download either Runtime with Management Tools or Runtime with Advanced Services. This will come with the SQL Server Management Studio Express which is the user interface to the database
Another option is to install a web infrastructure stack which includes Apache, PHP and PosgreSQL or MySQL. These exist for Windows, Mac or Linux. You can get stacks with PosgreSQL here or with MySQL here
How to interact with the databases?
The commercial databases will come with a software to connect directly to the database and write SQL queries. The open source databases (PosgresSQL and MySQL) do not. You either have to interact through the console or a third app. I recommend Aqua Data Studio. You can get an evaluation license and renew it after 14 days. I have been renewing it for several months and it still works! This app works as an interface for all databases.