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1. |
Given the following schema:employees(emp-id, first-name, last-name, hire-date,dept-id, salary)departments(dept-id, dept-name, manager-id, location-id)You want to display the last names and hire dates of all latest hires in their respective departmentsin the location ID 1700. You issue the following query:SQL>SELECT last-name, hire-dateFROM employeesWHERE (dept-id, hire-date) IN(SELECT dept-id, MAX(hire-date)FROM employees JOIN departments USING(dept-id)WHERE location-id = 1700GROUP BY dept-id);What is the outcome? |
A. | It executes but does not give the correct result |
B. | It executes and gives the correct result. |
C. | It generates an error because of pairwise comparison |
D. | It generates an error because the GROUP BY clause cannot be used with table joins in a subquery. |
Answer» C. It generates an error because of pairwise comparison | |