DEMIAN, Daniel: Prekladač relačných jazykov. [Bachelor Thesis]. Matej Bel University in Banská Bystrica. Faculty of Natural Sciences; Department of Informatics. Supervisor: Mgr. Adam Dudáš, PhD. Degree of accepted classification: Bachelor. Banská Bystrica: 2022. 59 p. The aim of the presented bachelor thesis is to design and implement an automatic translator for relational languages. The bachelor thesis is divided into theoretical and practical sections. In the theoretical section we analyze formal relational languages (relational algebra, relational calculus) and SQL language, focusing on effective ways of translation between given relational languages. In this section, we further analyze available translation tools on the Internet. The aim of the practical section is to create an application that serves as a translator for relational languages. In this section we describe the design and implementation of the created tool. In the design of the tool we describe the created grammar for translation from the Slovak language. The created tool translates between relational algebra, relational calculus and SQL language in all directions. The Created tool is able to translate from the modified Slovak language according to the created grammar and optimize the demands in relational algebra. At the end of the bachelor's thesis, we experimentally verified the functionality of the created tool on a set of queries and compared it with the tools we described in the theoretical part.