Abstract

NoSQL database systems have been becoming more and more popular and accepted by a database users thus their rapid development is nowadays observed. Because of this fact, modern database engines and their categories in the form of the Venn diagram are mentioned in the paper. Besides, the possibilities of using declarative languages that are modeled on SQL - the language for relational databases – in NoSQL, are presented. For this purpose selected NoSQL technologies are given in more details and their query languages are described. Moreover, the NoSQL language commands’ equivalents of SQL standard are provided in this document.

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