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### SQL
* [Kurs SQL](https://dbadmin.net.pl/category/sql/) - Łukasz Bartnicki, (HTML) (:construction: *in process*)
* [Kurs SQL](https://www.sqlpedia.pl/kurs-sql) - Jakub Kasprzak
* [PL/SQL - podstawy (na stronie)](http://andrzejklusiewicz.blogspot.com/2010/11/kurs-oracle-plsql.html)
* [SQL - podstawy (na stronie)](http://andrzejklusiewicz.blogspot.com/2010/11/kurs-oracle-sql.html)