Relational Database system

A database key is an attribute utilized to identify data in a_________

• simple key

• composite key

• candidate key

• relation

_____________ is a key that contains more than one attribute

______________ is the candidate key which is selected as the principal unique identifier.

Relational Constraints provide a way of ensuring changes made tot he database by authorized users do not result in a loss of data consistency.

• yes

• No

___________ states that the key attribute value in each tuple must be unique i.e., no two tuples contain the same value for the key attribute.

• domain constraint

• key constraint

• integrity constraint

• check constraint

__________ is used to represent the real world objects and relationships among the objects.

E-R model is called as ______________

An Entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.

• one-to-one

• one -to- many

• many-to-one

• many-to-many

draw a diagram of one to many relation-ship

__________ is on whose existence depends on other entity or entities.