Question

defferentiate between primary key and foreign key​

Answer 1

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

foreign key is used to maintain relationship between two tables. Primary of a table act as forgein key in the other table.

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Answer 2

Answer:

A primary key constrain is a column or group of columns that uniquely identifies every row in the table of the relational database management system. Foreign key is a column that creates a relationship between two tables.