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Featured DBMS

What is the primary key?

Within a given relation, a set of one or more attributes having values that are unique within the relation and thus can uniquely identify that tuple, is said to be the primary key of the relation.

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Primary key in DBMS

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Primary Key

Within a given relation, a set of one or more attributes having values that are unique within the relation and thus can uniquely identify that tuple, is said to be the primary key of the relation. A Primary Key is a set of one or more attributes that can uniquely identify tuples within the relation. (adsbygoogle = window.adsbygoogle || []).push({}); Every relation does have a primary key. In our sample database, SuppNo is the primary key for Suppliers as it contains a unique value for each tuple in the relation. Similarly, ItemNo is the primary key for Items, and the combination

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Keys in DBMS

It is important to be able to specify how rows in a relation are distinguished conceptually, rows are distinct from one another, but from a database perspective, the difference among them must be expressed in terms of their attributes. Keys come here for a rescue. (adsbygoogle = window.adsbygoogle || []).push({}); 1. Primary KeyWithin a given relation, a set of one or more attributes having values that are unique within the relation and thus can uniquely identify that tuple, is said to be the primary key of the relation. A Primary Key is a set of one or more attributes that can

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