You will be given a business scenario for a University Medical Center, which is a small community hospital.
Independent Entities Independent entities are those which can exist without another entity. Student, seat, instructor etc. Dependent Entities Dependent entities rely upon the existence of other entities. Some of their attributes are taken from the identifiers in the entities upon which they depend.
Class is an example of a dependent entity. It relies upon course and section, and gets two of its attributes from their identifiers. For cardinality, a fork or crow's foot intuitively indicates "many", by its many "toes".
We want to store information about several desks. The information we want to collect and store are the desk id, colour of the desk, and desk size.
These are the attributes of the entity. Given the id of a desk, we would be able to seek out one specific desk, as no two would have the same id number.
It is shown by a line which normally connects two entities together. No cardinality or modality has been assigned yet. This is a 1: Each side of the relationship has a cardinality of 1. The modality on each side is also 1. A student must fill at least 1 seat, and 1 seat must be filled by at least one student.
Although it may seem possible to have an empty seat, in which case the modality would be 0, the business rules we have defined determine that for the purposes of our database — we do not want to be able to store information about empty seats.
One instructor can teach many courses, but one course can only be taught by one instuctor. The modality is one on both ends of the relationship.
According to the business rules we have defined — an instructor must teach at least 1 course, and a course must be taught by 1 instructor. This is a M: One student can take many courses, and one course can be taken by many students. For the purposes of the information we want to store, the business rules indicate that a student must take at least one course, and a course must be taken by at least one student.
The modaility is 1 on both sides. One professor can teach many sections of a course, and 1 section of a course can only be taught by 1 instructor. On the modality side of things — a professor does not need to teach a section at all, so the modality is zero on that side of the relationshp.
On the other hand, a section must be taught by 1 instructor.Relationship Strength Weak or Non-identifying → the FK and only the FK of the related table is the PK of another Sales had the Agent's ID (the Agent PK) as a FK Pretty much the standard type of FK relationship we've been talking about in our examples so far Drawn as a dashed line in a Crow's Foot ERD Strong or Identifying → the FK of the related.
(15 points) PART B: Please draw an Entity Relationship Diagram for the following scenario: A department store has a bridal registry. This registry keeps information about the customer (usually the bride), the products that the store carries, and the products for which each customer registers.
The ERD example models the following scenario: A salesperson may manage many other salespeople. A salesperson is managed by only one salespeople.
A salesperson can be an agent for many customers. A customer is managed by one salespeople. A customer can place many orders.
An order can be placed by one customer. An order lists [ ]. CIS Lab 2 The Expanded Entity Relationship Diagram This lab introduces the next step in creating a data model, the Entity Relationship Diagram (ERD).
You will be given a business scenario for a University Medical Center, which is a small community hospital. 2. Draw at least two use Case diagrams for the proposed system of ASC. 3. Write Use Case scenarios for above use cases. Use the simplified template form the slides. 4. Draw the Entity Relationship Diagram for the proposed system.
Clearly indicate entities, attributes, relationships and cardinalities 5. The following assignment is based on the database environment proposed in the Week One Individual Assignment. Perform a logical design on the proposed database environment without going through the full normalization plombier-nemours.come the identification .