Explain following terms with suitable example.

(i) Weak entity set

(ii) Data manipulation language

(iii) Foreign key

(iv) Super key

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