Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Chapter 4, Problem 18E
Explanation of Solution
Query for finding the employees with no manager:
Consider the “Employee
select employee_name from employee natural left outer join manages where manager_name is NULL;
Explanation:
- In the above query, select the employee names with no managers using the outer join between employee and manages table.
- Use “is NULL” constraint to ensure that records with manager name attribute as null values are also selected...
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Chapter 4 Solutions
Database System Concepts
Ch. 4 - Prob. 1PECh. 4 - Prob. 2PECh. 4 - Prob. 3PECh. 4 - Prob. 4PECh. 4 - Prob. 5PECh. 4 - Prob. 6PECh. 4 - Prob. 7PECh. 4 - Prob. 8PECh. 4 - SQL allows a foreign-key dependency to refer to...Ch. 4 -
Given the relations a(name, address, title) and...
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