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Last Updated: Jun 07, 2026
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1. What is the difference between UNION and UNION ALL?
A) UNION works with subqueries, while UNION ALL does not.
B) UNION combines columns, while UNION ALL combines rows.
C) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
D) UNION includes all rows, while UNION ALL removes duplicates.
2. Which type of subquery returns exactly one value?
A) Inline view
B) Multiple-row subquery
C) Correlated subquery
D) Scalar subquery
3. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;
A) The current date in the format 'DD-MM-YYYY'
B) An error
C) The current date in the default system format
D) The time part of the current date
4. Which statement can be used to undo changes made in a transaction?
A) COMMIT
B) ROLLBACK
C) MERGE
D) SAVEPOINT
5. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?
A) WHERE
B) SET
C) HAVING
D) FROM
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: B | Question # 5 Answer: A |
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