A relational DBMS organizes and accesses data according to relationships among data items. The relationships among data items are expressed by tables consisting of columns and rows. The order of the ...

Another type of non-relational database is the "object database," which stores data consistent with their object model (see object database). Routine queries to a relational database often require ...

Relational database-management systems (RDBMS) only model data as a set of tables and columns, carrying out complex joins and self-joins when the dataset becomes more inter-related. Such queries ...

Object databases are also suited for applications that are not necessarily based on an object model, but use a large ... are difficult to store in a relational database. Object databases may ...