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In an Entity-Relationship (ER) model, suppose ? is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in ? and that the cardinality of E1 is greater than the cardinality of E2. Which one of the following is true about ??
In set associative and associative mapping there exists less flexibility.
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.This is called as
The associative mapping is costlier than direct mapping.
Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?
In a 1:N relationship, the parent is the entity on the one side of the relationship and the child is the entity on the N side of the relationship.
If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has
Which of the following statements is/are TRUE? (i) Weak entity has always total participation in the identifying relationship. (ii) Every relation schema must have at least one weak entity.
When mapping a regular entity into a relation which of the following is true?
Which of the following refers to an entity in which the identifier of one entity includes the identifier of another entity?