## about this topic

The database is where a system’s real value lives: the data. This hub concentrates the CodeCrush articles on storage and modelling — relational databases such as MySQL and PostgreSQL, NoSQL alternatives, the SQL language, modelling best practices and the trade-offs that decide which database fits which application. The guides explain concepts such as transactions, indexes, normalisation and replication with practical examples, and connect the theory to real corporate use: performance, scalability and integrity in systems that cannot go down. If you work with data — as a backend developer, an analyst or a DBA — this is your starting point.