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20-Jul-2018 09:32

The development of database technology can be divided into three eras based on data model or structure: navigational, SQL/relational, and post-relational.

The sum total of the database, the DBMS and its associated applications can be referred to as a "database system".Codd, departed from this tradition by insisting that applications should search for data by content, rather than by following links.The relational model employs sets of ledger-style tables, each used for a different type of entity.Since DBMSs comprise a significant market, computer and storage vendors often take into account DBMS requirements in their own development plans.