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In a relational database, a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction Database Keys are used to establish and identify relationships between tables and within a table. Primary key, Foriegn Key, Composite Key, Candidate Key and Super Key
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Referential integrity constraints. Referential integrity constraints is base on the concept of Foreign Keys. A foreign key is an important attribute of a relation Definition: A super key is a set or one of more columns (attributes) to uniquely identify rows in a table. Often people get confused between super key and
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