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New senior classes

I have created two classes for senior freelancers. PHP and PL/SQL.  I think PHP is not very good language but it is popular among freelancers. Follow this class to learn how to quickly build a website.

PL/SQL is specific to Oracle databases. Then why is one of the most useful language for freelancers? It is because learning this language you can create back-end complex business applications. You also learn SQL that can be useful for other databases.