How to check what Database Engine is installed on the DataBase server that I have acces to run queries on?

I want to check what type of sql is running on a Datasase server that I can access. I only have access to a web interface and a list of tables. Through the interface I can run queries on the tables that are present on a list. How can I get more information about the server and the version that the server is running. I have no idea about the IP or the PORT that the server is running. I want to know if the server is MySQL, Mircosoft SQL Server, Oracle SQL, Postgre SQL or other sql server. The website that I am talking about is this one: [w3schools.com SQL editor](http://www.w3schools.com/sql/trysql.asp?filename=trysql_select_all) . EDIT 2: although for some the command select sqlite_version() works for me it does not work. This is the screenshot of the response. EDIT 3 : On Chromium Browser the command is working properly. However on Firefox Browser the command did not work. I also mention that I am on running Linux. What do you think could be the reason why on Firefox and on Chrome I get different results ?