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SQL definition. definition of entity database. Database entity. An database entitiy is a material or non-material structure which has its own attributes. A good example of database entity can be a simple table that contains set of some data. To show it, letâs take an example of shop database which is composed of 2 tables (entities): Sellers and Products.
Entity integrity is one of the primary rules of effective database construction. It refers to the process of enforcing a primary key for each table in a database, where the key must be either a row or a combination of rows that are unique non-null values.