20 - Consider the following Entitiy Relationship diagram. Which of the following relation will not hold if the above ER diagram is mapped into a relational model? I) Product (ProductId, Desciption) II) Requests (ProductId, Orderld) II) Order (Orderld, Productld, Date) IV) Order (Orderld, Date)

20 - Consider the following Entitiy Relationship diagram. Which of the following relation will not hold if the above ER diagram is mapped into a relational model? I) Product (ProductId, Desciption) II) Requests (ProductId, Orderld) II) Order (Orderld, Productld, Date) IV) Order (Orderld, Date)

Database Systems: Design, Implementation, & Management

12th Edition

ISBN:9781305627482

Author:Carlos Coronel, Steven Morris

Publisher:Carlos Coronel, Steven Morris

Chapter8: Advanced Sql

Section: Chapter Questions

Problem 18RQ

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Question

20 - Consider the following Entitiy Relationship diagram. Which of the following relation
will not hold if the above ER diagram is mapped into a relational model?
I) Product (ProductId, Desciption)
II) Requests (ProductId, Orderld)
III) Order (Orderld, Productid, Date)
IV) Order (Orderld, Date)
ProductID
Description
Orderld
Date
M
N
Product
Requests
Order
IV
b)
II
c) O I
d) O I|

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Develop an Entity Relationships Diagram (ERD) based on the relational schemas in the 3NF for the starting relational schema in un-normalized form presented below. UNF:Order(OrderID, OrderDate, CustID, CustName, CustPhone, CCNum, CCExpDate, CCBank, BnkContName, BnkContPhone, CustEmail, OrderIP, SiteRefFrom, ShipStreet, ShipCity, ShipSt, ShipZip, OrderLineNum, ItemID, ItemName, ItemDesc, ItemQtyOrdered,ItemListPrice, ItemSalePrice, ItemQtyShip, ShipCharge, Tax, TotalDue)
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For developing our queries, we will be using the following relational schema: Student(SID, name, username, major) Course(cname, description, department, weight) Offering(OID, cname, year, term, duration) Enrolled(SID, OID, grade) A course relation is the generic description of a course which is offered by a department. The offering relation is the specific instance of a course being taught in a given term, and is the entity which will be associated with the student enrollment. Students are enrolled in these offerings and achieve a mark. Express each of following queries in Relational Algebra: | Write a relational algebra query which will list the cname and description of all the courses which are being offering in the Fall 2018 term. 2 Write a relational algebra query which will list the name of all the students who have earned 60% in both 'COSC2P12' and 'COSC2P13'.
Which of the following statements corresponds to the second normal form for an entity - relationship model in relational databases? A relationship must have only one key and the attributes můst have simple donains B A relationship must have a Kev, with simple domains for its attributes and all non-key attributes depend entirely on the key A relationship must have a key with static domains for its attributes which all depend on the key A relationship must have only one key with all attributes dependent on the key. A. D
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