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Relational Database Management Systems (RDBMS) such as Oracle, MySQL and Microsoft SQL Server belong according to the current DB Engines ranking one of the most popular on the market. Considered highly reliable and avoiding inconsistencies in data records, they have been the established standard for databases in most companies for decades.

The Structured Query Language (SQL) database language is most commonly used to query and process the data in it. For example, users communicate through a product search mask in a web shop with a server, which in turn searches a database and returns the results to the web shop as search results.

In this way, the information stored is susceptible to what is known as SQL Injection (SQLi), which injects arbitrary code into database queries. This makes it possible to read or change information without permission. In the worst case, the intruders gain control of the entire database.