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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 departments in the location ID 1700. You issue the following query:SQL> SELECT last-name, hire-date FROM employees WHERE (dept-id, hire-date) IN (SELECT dept-id, MAX(hire-date) FROM employees JOIN departments USING(dept-id) WHERE location-id = 1700 GROUP 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. | 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. generates an error because of pairwise comparison | |