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10. What would the below SQL query returns? UPDATE EMPLOYEE SET Salary = Salary * 1.1 WHERE Dno = IN (SELECT Dnumber FROM DEPARMENT WHERE Dname = 'Research');

10. What would the below SQL query returns? UPDATE EMPLOYEE SET Salary = Salary * 1.1 WHERE Dno = IN (SELECT Dnumber FROM DEPARMENT WHERE Dname = 'Research');

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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**Question 10: What will the following SQL query return?** ```sql UPDATE EMPLOYEE SET Salary = Salary * 1.1 WHERE Dno = IN (SELECT Dnumber FROM DEPARTMENT WHERE Dname = 'Research'); ``` **Explanation:** This SQL query updates the `EMPLOYEE` table by increasing the `Salary` of employees by 10% (`Salary * 1.1`). It specifically targets employees whose `Dno` (Department Number) matches any department numbers retrieved from a subquery. **Subquery Breakdown:** - The subquery `SELECT Dnumber FROM DEPARTMENT WHERE Dname = 'Research'` selects the department number(s) from the `DEPARTMENT` table where the department name (`Dname`) is 'Research'. **Overall Query Function:** - The query applies the salary increase only to employees in the 'Research' department by matching their department numbers with those retrieved by the subquery.
Transcribed Image Text:**Question 10: What will the following SQL query return?** ```sql UPDATE EMPLOYEE SET Salary = Salary * 1.1 WHERE Dno = IN (SELECT Dnumber FROM DEPARTMENT WHERE Dname = 'Research'); ``` **Explanation:** This SQL query updates the `EMPLOYEE` table by increasing the `Salary` of employees by 10% (`Salary * 1.1`). It specifically targets employees whose `Dno` (Department Number) matches any department numbers retrieved from a subquery. **Subquery Breakdown:** - The subquery `SELECT Dnumber FROM DEPARTMENT WHERE Dname = 'Research'` selects the department number(s) from the `DEPARTMENT` table where the department name (`Dname`) is 'Research'. **Overall Query Function:** - The query applies the salary increase only to employees in the 'Research' department by matching their department numbers with those retrieved by the subquery.
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