Question

a ____ is a field which uniquely identifies each record in a table.​

Answer 1

Answer:

Primary Key

Explanation:

A primary key is a field which uniquely identifies each record in a table.

Answer 2

A primary key is a field that uniquely identifies each record in a table.

• It is a special type of unique identifier that cannot contain null values and must be unique for each record in the table.
• The primary key is used to establish relationships between tables and to enforce data integrity by ensuring that there are no duplicate records in the table.
• In a database, a primary key is a column or a set of columns that uniquely identify each record in a table.
• It serves as a unique identifier for each record in the table and allows for efficient searching, sorting, and retrieval of data.
• A primary key cannot be duplicated, nor can it be null. The primary key is also used to establish relationships between tables in a relational database.
• When a primary key is used in another table, it is called a foreign key.
• The foreign key allows for the creation of relationships between tables and the enforcement of referential integrity constraints.

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