A primary key is a unique identifier for a record in a database table. It ensures that each record in the table can be uniquely identified and accessed. A primary key must have a unique value for each record and cannot be null.

A foreign key, on the other hand, is a field in a database table that refers to the primary key of another table. It establishes a relationship between two tables by linking the primary key of one table to the foreign key of another table. This relationship allows data to be shared and connected between the tables.

To summarize:
- A primary key is a unique identifier for a record in a table.
- A foreign key is a field in a table that refers to the primary key of another table.
- Primary keys ensure uniqueness and accessibility of records.
- Foreign keys establish relationships between tables by linking to primary keys.

Question

A primary key is a unique identifier for a record in a database table. It ensures that each record in the table can be uniquely identified and accessed. A primary key must have a unique value for each record and cannot be null.

A foreign key, on the other hand, is a field in a database table that refers to the primary key of another table. It establishes a relationship between two tables by linking the primary key of one table to the foreign key of another table. This relationship allows data to be shared and connected between the tables.

To summarize:
- A primary key is a unique identifier for a record in a table.
- A foreign key is a field in a table that refers to the primary key of another table.
- Primary keys ensure uniqueness and accessibility of records.
- Foreign keys establish relationships between tables by linking to primary keys.

Knowee AI · Accepted Answer

A primary key is a unique identifier for a record in a database table. It ensures that each record in the table can be uniquely identified and accessed. A primary key must have a unique value for each record and cannot be null.

A foreign key, on the other hand, is a field in a database table that refers to the primary key of another table. It establishes a relationship between two tables by linking the primary key of one table to the foreign key of another table. This relationship allows data to be shared and connected between the tables.

To summarize:
- A primary key is a unique identifier for a record in a table.
- A foreign key is a field in a table that refers to the primary key of another table.
- Primary keys ensure uniqueness and accessibility of records.
- Foreign keys establish relationships between tables by linking to primary keys.

What is a primary key & foreign key?

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