Relational Query

A relational database is a database that has a collection of tables of data items, all of which is formally described and organized according to the relational model. Data in a single table represents a relation, from which the name of the database type comes. In typical solutions, tables may have additionally defined relationships with each other.In the relational model, each table schema must identify a column or group of columns, called the primary key, to uniquely identify each row.
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