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The most common definition of an RDBMS is a product that presents a view of data as a collection of rows and columns, even if it is not based strictly upon [[Relational model|relational theory]]. By this definition, RDBMS products typically implement some but not all of Codd's 12 rules.
A second school of thought argues that if a database does not implement all of Codd's rules (or the current understanding on the relational model, as expressed by [[Christopher J. Date]], [[Hugh Darwen]] and others), it is not relational. This view, shared by many theorists and other strict adherents to Codd's principles, would disqualify most DBMSs as not relational. For clarification, they often refer to some RDBMSs as ''truly-relational database management systems'' (TRDBMS), naming others ''pseudo-relational database management systems'' (PRDBMS).{{citation needed| reason=no references| date=4 January 2024}} <!-- It can also be said as the raw database management system.-->
As of 2009, most commercial relational DBMSs employ [[SQL]] as their [[query language]].<ref>{{cite journal |last1=Ramakrishnan |first1=Raghu |last2=Donjerkovic |first2=Donko |last3=Ranganathan |first3=Arvind |last4=Beyer |first4=Kevin S. |last5=Krishnaprasad |first5=Muralidhar |year=1998 |title=SRQL: Sorted Relational Query Language |journal=E Proceedings of SSDBM |url=http://pages.cs.wisc.edu/~beyer/papers/srql_ssdbm98.pdf}}</ref>
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