This paper aims to present some considerations on non-relational databases (called NoSQL) that are increasingly being used by applications (especially the Web, such as Youtube, Amazon, Google and Facebook) that both have to store an impressive volume of data, and to provide, on the basis of these data, quick responses to concurrent queries with rising rhythm levels. A correct syntax sample is presented for grouping a set of data ready to be successfully inserted into a NoSQL data base, and illustrated with several examples of how to make connections through concrete examples; comparative samples of queries are also provided(SQL vs NoSQL).