Indicate if the following statements are true or false. For false statements, explain why the statement...

Indicate if the following statements are true or false. For false statements, explain why the statement is false or give the correct answer.(1 point each)

6. A simple attribute can be broken down into smaller components.

7. The relationship between a weak and strong entity is called a multiple relationship.

8. An identifier is a combination of two or more attributes from two tables.

9. A unary relationship must have mandatory many cardinality on both sides.

10. If two entities are related many to many, we take the primary key of each entity and make it a foreign key in the other.

11. Compare and contrast overlap rule and disjoint rule. Compare and contrast total and partial specialization. (2.5+2.5=5 points total)

Solutions

Expert Solution

Q6:false

It is false because the Composite attribute can be broken down in to simpler components.simple attributes can't be divided.

Q7:false

False because the relation between the strong entity and weak entity is called identifying relationship

Q8:false

False because identifier is the name of objects,it is the name given by database designer or system users to data base objects such as tables, views etc

Q9:false

The Unary relationship is when both participants in relationship are same. So not mandatory and not have many cardinality

Q10:True

The primary keys in each entities and make foreign in key in many to many.

Q11:a)disjoint rules states that an entity instance of an super type can only be a member of one sub type. The overlap rules states an entity instance of a supertype can be a member of multiple subtypes

Disjoint events are events that don't have any outcomes in common. and overlap have outcome in common.

B) total specialization rule demands that every entity in the super class. Symbolized with a double line

Partial specialization exist when every instance of a super type does not have to be an instance of a subtype

venereology answered 7 months ago

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