Question

the group of one or more columns used to uniquely identify each row of a relation is called______
1)foreign key
2)primary
3)key
4)primary key​

Answer 1

• PRIMARY KEY is a column or group of columns in a table that uniquely identify every row in that table. The Primary Key can't be a duplicate meaning the same value can't appear more than once in the table.

Answer 2

Answer:

I think this will help you

Explanation:

Primary Key - is a column or group of columns in a table that uniquely identify every row in that table. Candidate Key - is a set of attributes that uniquely identify tuples in a table.