Question

differentiate between a primary key and foreign key​

Answer 1

Answer:

Primary key is used to identify data uniquely therefore two rows can't have the same primary key. It can't be null. On the other hand, foreign key is used to maintain relationship between two tables. Primary of a table act as forgein key in the other table.

Answer 2

Explanation:

Primary key

1. Primary key is used to identify data uniquely therefore two rows can't have the same primary key.

2. It can't be null.

Foreign key

1. Foreign key is used to maintain relationship between two tables.

2. Primary of a table act as forgein key in the other table.