My server is Joomla 2.5, the version of CB is 1.8.1 and it runs on a MySQL database.
I would like to analyze the data in my database and create simple reports, for example: a list of all email addresses of all subscribers in a given period in time.
Is the right tool for this available in CB, in Joomla as an extension or should I go for a separate tool to dive into the database directly?
I searched in the CB site for reporting but didn't find a plugin for it, did find some 'advanced search' extensions for Joomla but they do not support reports as such.
Community Builder won't do this on it's own.
The easiest and quickest way to achieve this is to use an extension like ChronoForms and/or ChronoConnectivity which can help retrieve and display the required data from one or more tables.
ChronoForms: http://extensions.joomla.org/extensions/contacts-and-feedback/forms/1508 ChronoConnectivity: http://extensions.joomla.org/extensions/directory-a-documentation/directory/5661
These extensions make it easy to restrict a report to a particular group etc without having to write code.
There are plenty of examples in the chronoengine.com FAQs and the forum if you need help.