D Web portal contains a list of the MySQL, Oracle and PostgreSQL database error codes. The code can be found with its description in many localizations and compared its existence through different versions of the database.
Database error codes
iKariéra is the web portal dedicated to working students and graduates of technical schools. Registered companies may offer work in the form of advertisements that can be searched by candidates divided to regions of the Czech Republic. There is also a list of all registered companies that the applicant can contact without having an active advertisement. The portal also provides articles focused on jobs.
WorldOpinion is the web portal that collects statistical data of public opinions through simple questions with answers offered for election by registered users. Data are displayed as graphs and maps, divided into countries and regions.