The most common language used out there is PHP. There are millions of tutorials out there. Especially ones that deal with managing databases, which in most cases are MySQL.
The other option (not as widely used as PHP) is ASP. I'm sure there are many tutorials for this too, however being a PHP man myself, I am not too certain in this case. Not too sure what ASP connects to database wise.
Those are the only two I'm aware of.
Here are some tutorials:
PHP: http://www.tizag.com/mysqlTutorial/
ASP: http://www.plus2net.com/asp-tutorial/db-mssqlconn.php
Any kind of search in Google should give you results.
Hope this is some kind of help for ya
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