Examine the following and draw parallels: Concentration vs breadth Case of Entity;Class of Entity
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Examine the following and draw parallels:
Concentration vs breadth
Case of Entity;Class of Entity
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- Analyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?The cardinality ratio depends on the real-world meaning of the entity types involved and is defined by the specific application. For the binary relationships below, suggest cardinality ratios based on common-sense meaning of the entity types. Clearly state any assumptions you make. Entity 1 Student Cardinality Ratio Entity 2 Course Item Class Teacher TextBook wwwwwwwwwww Order InstructorThe difference between a weak entity set and a strong entity set should be explained.
- What are the differences between weak and strong entity sets?Explain the distinction between entity type and entity instance.The cardinality ratio depends on the real-world meaning of the entity types involved and is defined by the specific application. For the binary relationships below, suggest the cardinality ratios based on your understanding. Clearly state any assumptions you make. # Entity 1 Cardinality Ratio Entity 2 1 Student Social Security No. 2 Student Teacher 3 Classroom Wall 4 Course Text Book 5 Class Instructor
- What does an associative entity model? a.) Associative entities model pure relationships rather than entities. b.) Associative entities model entities that are independent. c.) Associative entities model the real-world scenarios of ways to look up data. d.) Associative entities model attributes and how they are linked to entities.Prepare an entity relationship diagram for the revenuecycle that includes entities, cardinalities, andreflects the following business rules:• Customers place many orders during the period• Each sales order consists of one or more line itemsof inventory.• Customers are billed twice a month for the purchasesthat they made during the period.• Customers make payments once a month to settletheir accounts.For each entity, there needs to be an indication of whether it is one-to-one, one-to-many or many-to-many relationship. Here are the answers I have but I could use more guidance with it. I struggle with this type of question. BOOK and BOOK COPY (1:1) COURSE and COURSE-SECTION (M:N) COURSE-SECTION and ROOM (M:1) INSTRUCTOR and COURSE (1:M) ROOM and INSTRUCTOR (M:1)
- Given the ER diagram above, answer the following questions: a. Name an entity type that has more than 2 relationships. b. Name one ket attribute and the entity type it belongs to. c. Name one one-to-one relationship and the entity types it relates. d. Name one many-to-many relationship and its entity types. e. Name one relationship attribute. f. What is the cardinality of relationship ‘employs’? g. What is the cardinality of relationship ‘textUsed’? h. Name one weak entity type i. Does it have a partial key? If yes, name it. ii. Name its identifying entity type iii. Name its identifying relationship Question 2 A bank provides services to customers. The banks is identified by its code and has a name and an address. The bank has several branches. A branch is identified by its code that is unique for a given bank. The branch name and address are also stored in the database. Customers deal with the bank through the bank branches. So, a customer belongs to a specific bank branch. Customers…When an attribute of one entity type references another entity type's attribute, this means that: O it is a derived attribute O weak entity type exists O a relationship exists O it means nothingWorkHours is a weak entity. What would you do to transform it into a strong entity? Would it be desirable to change it into a strong entity? Why or why not?