What is a primary key answer the following question?

Question

A primary key is the column or columns that contain values that uniquely identify each row in a table. A database table must have a primary key for Optim to insert, update, restore, or delete data from a database table.

What is primary key class 11th?

Primary Key: A candidate key that is primarily chosen for unique identification of tuples in a Relation. Any subset of Primary key should not be Primary key. Alternate Key: Candidate keys that not chosen as primary key are the alternate keys. Example: In a LIBRARY Table.

What is a primary key class 8?

A Primary key is a check on the table that uniquely identifies each record on a table. It does not contain any duplicate data. A table can have only one Primary key.

What is a primary key class 12?

Answer: A primary key is a set of one or more attributes that can uniquely identify tuples within the relation. e-g. The attribute ItemNo is a primary key as it contains unique value for each tuple in a relation.

What is a primary key class 10?

Answer: A field which uniquely identifies each record in a table is known as primary key.

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