Question

what are primary key and foreign key​

Answer 1

Answer:

Primary key uniquely identify a record in the table. Foreign key is a field in the table that is primary key in another table. Primary Key can't accept null values. Foreign key can accept multiple null value.

Explanation:

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Answer 2

Answer:

A primary key is used to ensure data in the specific column is unique. A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. ... It refers to the field in a table which is the primary key of another table. Only one primary key is allowed in a table.