ORACLE 12C: SQL
17th Edition
ISBN: 9781305449947
Author: CASTEEL
Publisher: CENGAGE L
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Chapter 1, Problem 7RQ
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Difference between a foreign key and a primary key:
| Foreign key | Primary key |
| A primary key attribute in one table is the foreign key for another table. In a logical way, a foreign key is used to establish a link between two tables. | In relational |
| A foreign key is used for identifying a row of another table uniquely. | A primary key may have a single attribute or multiple attributes. |
| A foreign key may be a field or group of fields in a table. As a foreign key may be a column or group of columns. | The primary key will contain a unique value for each row of data. |
| Foreign key must not be null when the minimum cardinality of a data in a column of a table is implied as one... |
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Given the dependency diagram of attributes C1,C2,C3,C4,C5 in a table shown in the following figure, the primary key attributes are underlined
Make a database with multiple tables from attributes as shown above that are in 3NF, showing PK, non-key attributes, and FK for each table? Assume the tables are already in 1NF. Hint: 3 tables will result after deducing 1NF -> 2NF -> 3NF
Consider the ER diagram of online sales system above. Based on the diagram answer the questions below,
1. Based on the ER Diagram, determine the Foreign Key in the Product Table. Just mention the name of the attribute that could be the Foreign Key
2. Is there a direct relationship that exists between Store and Customer entities? AnswerYes/No?
Consider the ER diagram of online sales system above. Based on the diagram answer thequestions below,
1. Mention the relationship between the Order and Customer Entities. You can use the following:
1:1, 1:M, M:1, 0:1, 1:0, M:0, 0:M
2. Which one of the 4 Entities mention in the diagram can have a recursive relationship?
3. If a new entity Order_Details is introduced, will it be a strong entity or weak entity? If it is a weak entity, then mention its type (ID or Non-ID, also Justify why)?
NO AI use pencil and paper
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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