Interview Questions - DBMS Basics

What is an attribute?
It is a particular property, which describes the entity.

What is a Relation Schema and a Relation?
A relation Schema denoted by R(A1, A2, ..., An) is made up of the relation name R and the list of attributes Ai that it contains. A relation is defined as a set of tuples. Let r be the relation which contains set tuples (t1, t2, t3, ..., tn). Each tuple is an ordered list of n-values t=(v1,v2, ..., vn).

What is degree of a Relation?
It is the number of attribute of its relation schema.

What is Relationship?
It is an association among two or more entities.