Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 1, Problem 6HOA
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Entity Relationship model
- An entity-relationship model describes interrelated things of interest in a specific domain of knowledge.
- It is composed of entity types and specifie...
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A college course may have one or more scheduled sections or may not have a scheduled section. Attributes of COURSE include Course ID, Course Name, and Units. Attributes of SECTION include Section Number and Semester ID. Semester ID is composed of two parts: Semester and Year. Section Number is an integer (such as 1 or 2) that distinguishes one section from another for the same course but does not uniquely identify a section. How did you model SECTION? Why did you choose this way versus alternative ways to model SECTION?
When building a data model, why is it sometimes preferable to
leave out certain information?
When building a data model, why is it sometimes preferable to not include a certain piece of information?
Chapter 1 Solutions
Oracle 12c: SQL
Ch. 1 - Prob. 1RQCh. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Discuss the problems that can be caused by data...Ch. 1 - Explain the role of a primary key.Ch. 1 - Prob. 7RQCh. 1 - Prob. 8RQCh. 1 - What type of relationship can’t be stored in a...Ch. 1 - Identify at least three reasons an organization...
Ch. 1 - Prob. 1MCCh. 1 - Prob. 2MCCh. 1 - Prob. 3MCCh. 1 - Prob. 4MCCh. 1 - Prob. 5MCCh. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Which of the following has no partial or...Ch. 1 - Prob. 9MCCh. 1 - Which of the following has no partial dependencies...Ch. 1 - Which of the following has no repeating groups but...Ch. 1 - Prob. 12MCCh. 1 - Prob. 13MCCh. 1 - A unique identifier for a data row that consists...Ch. 1 - Which of the following symbols represents an...Ch. 1 - Prob. 16MCCh. 1 - Which of the following represents a field in a...Ch. 1 - Which of the following defines a relationship in...Ch. 1 - When part of the data in a table depends on a...Ch. 1 - Which of the following is used to join data...Ch. 1 - Which tables and fields would you access to...Ch. 1 - Prob. 2HOACh. 1 - Prob. 3HOACh. 1 - Prob. 4HOACh. 1 - Access path A database table is composed of...Ch. 1 - Prob. 6HOACh. 1 - Prob. 7HOACh. 1 - Prob. 8HOACh. 1 - Prob. 9HOACh. 1 - Prob. 10HOA
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- What actions can you take to make sure your model has all the data it needs? How may problem statements benefit from data modeling techniques?arrow_forwardWhen starting a data modeling project, what are the main differences between using an existing model and starting from scratch?arrow_forwardQuestion 3 Draw a detailed activity Diagram in draw.io and screenshot it for me. ( **Please take note is a detailed activity diagram) Scenario The exam unit uses the system after the subject registration period has closed. The system will display a list of subjects that have registered students. Using this list, the exam unit will plan out examination week. Examination week lasts 6 days, from Monday to Saturday. For each day, the exam unit will assign a subject to that day. Each day can have a total of 6 examination hours with subjects having 2- hour or 3-hour examinations. For example, if the subjects are 2-hour examinations, then 3 of them can be scheduled for the day and if the subjects are 3-hour examinations, then only 2 of them can be scheduled for the day. There can also be a mixture of 2-hour and 3-hour examinations. If the exam unit schedules too many examination hours for that day then the day resets and the exam unit needs to reschedule again. This process stops when…arrow_forward
- If a data item is expected to be included in a data model, why is it absent?arrow_forwardWhen it comes to a data modeling assignment, describe how using packaged data models differs from beginning with a blank page.arrow_forwardData Preparation Describe what you did with the data prior to the modelling process (data cleaning). Show histograms of the one example variable before and after any pre-processing that you carried out. If you corrected any mis- typed entries in the data, report what you changed. Carry out descriptive analysis and explain each what they represent, use as many graph as possible and provide the descriptionsarrow_forward
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