As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
Relational databases are data stores that are based on a relational model. It is this model that makes them so powerful. Its mathematical foundation allows us to reason about the results of operations and lets database engines perform appropriate optimizations.
Database access is also highly standardized, allowing multiple applications to coordinate by sharing their data even if these applications are built with different technologies. The standard that incorporates the relational algebra is the Structured Query Language (SQL).
Because using SQL ...