Question

Difference between primary key and foreign key.

Answer 1

A primary key is a column or a set of columns that uniquely identify a row in a table. A primary key should be short, stable and simple. A foreign key is a field (or collection of fields) in a table whose value is required to match the value of the primary key for a second table. ... A table can have multipleforeign keys.

Answer 2

Answer:

Explanation:

HEY MATE HERE IS YOUR ANSWER

Primary key : is unique key which identifies a row In a table of dbms.

It cannot accept null values

Foreign key : is key which identifies a column/set of columns in one (referencing table ) to column / set of columns in (referenced table).

Can accept null values

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