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1. What is the purpose of the MERGE statement in SQL?
A) To delete duplicate rows from a table
B) To join two tables into one
C) To combine the results of two queries
D) To update existing rows or insert new rows in a target table
2. What is the default order of evaluation when multiple SET operators are used in a query?
A) UNION, MINUS, INTERSECT
B) INTERSECT, UNION, MINUS
C) INTERSECT, MINUS, UNION
D) UNION, INTERSECT, MINUS
3. Which SQL keyword is used to remove duplicate rows from the result set of a query?
A) DISTINCT
B) ONLY
C) DISTINCTROW
D) UNIQUE
4. What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);
A) Employees with salaries greater than 1000
B) Employees working in location ID 1000
C) Employees with no department
D) Departments located in location ID 1000
5. Which clause can be used with SET operators to sort the final result set?
A) ORDER BY
B) HAVING
C) WHERE
D) GROUP BY
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: A | Question # 4 Answer: B | Question # 5 Answer: A |
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