Mumbai University > Computer Engineering > Sem 4 > Database Management System

Marks: 10M

Explain following terms with suitable example.

(i) Weak entity set (ii) Data manipulation language

(iii) Foreign key (iv) Super key

Weak entity set:

An entity set that does not have a primary key is referred to as a weak entity set.

The existence of a weak entity set depends on the existence of a identifying entity set:

a. It must relate to the identifying entity set via a total, one-to-many …