Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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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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What is the purpose of a primary key?
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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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- The primary key and the candidate key must be distinguished.arrow_forwardHow is a composite key different than a single key? a) It can be referenced by a forign key b) It cannot contain null values c) It is made of multiple columns c) It contains only unique valuesarrow_forwardIs it possible for you to identify a composite main key from a candidate key?arrow_forward
- Explain the difference between a primary key and a candidate key.arrow_forwardWhat exactly is a foreign key?arrow_forwardAlternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns.arrow_forward
- Can composite keys include composite attributes?arrow_forwardCandidate Key is a key that may have many duplicates may be absent may be a foreign key contain only unique values and fully defines all other attributes in a rowarrow_forwardPrimary keys and candidate keys may both be assigned to the same attribute.arrow_forward
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