What is primary key in Brainly?

What do you mean by primary key Brainly?

Brainly User. A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.

What is a primary key answer the following questions?

Answer: Primary key is a set of one or more attributes which can uniquely identify each tuple of a relation.

What is a primary key Wikipedia?

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID.

What is primary key and foreign key Brainly?

Primary is one or more attribute that uniquely each record in a table. Foreign key is one or more attribute that provide link between data in two table. ocabanga44 and 5 more users found this answer helpful.