Which of the following is NOT true? Mapping an M:N relationship that has no attributes will result in:
A new relation |
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Two foreign keys |
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A composite primary key |
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A foreign key in both of the relations mapped from the involved entities |
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Which of the following is NOT true? Mapping an M:N relationship that has no attributes will...
The primary key for M:N relationship tables O is a single attribute. @ always consists of two attributes. O is the primary key of the most important entity linked to that relationship does not exist. Many-to-many relationship tables only use foreign keys
Show the ERD for the following piece of the problem statements. Show only entities (or dependent entities), relationships, multiplicities, primary keys and foreign keys. Create an appropriate primary key if necessary. You don’t need to specify other attributes. If a relationship is M:N, then show two diagrams: both the M:N relationship diagram and its decomposition into two 1:N relationships. (a) A book has one or many keywords and one keyword can be used in zero or many books. (b) A...
If a 1:M relationship is optional on both sides, which of the following is true? The resulting foreign key can have null (empty) values The resulting foreign key cannot have null (empty) values The resulting foreign key must have null (empty) values No foreign key is created as a result of mapping such a relationship
6. Create a typical family relationship-spouse, father, and mother-in a single 3NF relation. Include Name and Date of Birth as non-key attributes. Assume that each family member has only one spouse, one father, and one mother. Show foreign keys with dashed undedine, and Primary keys with solid underline. (Come up with your own field names). (3 points) 6. Create a typical family relationship-spouse, father, and mother-in a single 3NF relation. Include Name and Date of Birth as non-key attributes. Assume...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
The employee is table, the best candidate for primary key is Select one: a. Department ID b. Employee hiredate c. Employee ID d. Employee salary Question 2 A primary key can be composed of more than one attribute. Select one: True False Question 3 A foreign key allows you to join two tables. Select one: True False Question 4 Given two tables, department (dept_id, dept_location, dept_name) and EMPLOYEE(emp_id, emp_name, emp_dept_id, emp_name, emp_salary), which attribute (column) is the foreign key? Select...
For this DATABASE homework assignment you will create an Entity Relationship model for a business case and then convert the model to a set of relations. Read through the following business case for the “Drum Corps International” Create an Entity relationship model with the necessary entities, attributes, identifiers and relationships to capture the data requirements. All relationships should be labeled with verb phrases. Use UML notation for this work. Relationship lines should not cross. ...
Please show three examples of binary relationship with maximum cardinality of 1:1, 1:N, and N:M (one for each). For each example, Identify two entities and their primary keys Identify and justify the maximum cardinality Now that we have we had three examples of binary relationship with maximum cardinality of 1:1, 1:N, and N:M (one for each). In addition, please refine the cardinality. For each example you had: Identify 3 or 4 attributes (including primary key) for each entity. Place foreign...
This is how i mapped the relational schema diagram. would this be correct? i feel like i am missing something. ud bundle at the start of the class on the due date. ment. 1. (10 pts) Use the ER-to-relational mapping algorithm to map the BANK ER diagram to a relational schema diagram. Prepare the diagram using ERDPlus and make sure to specify all primary keys and foreign keys. (Position the relations so that the arcs from the foreign keys to...
Name Use complete sentences if possible The following StudentGrade relation (table) stores the Student, Major, and Course information Each student has unique StudentID. Assume that a student has only one major. One student can take multiple courses in one SemesterYear. One course can be taken by many students in each SemesterYear. Given values for StudentID, Course Number, and SemesterYear, one can determine all the rest of values for a record. However only Grade is functionally dependent on StudentlD, CourseNumber and...