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Oracle Database 23ai SQL Associate Sample Questions:

1. How can you ensure that data is sorted in descending order in a SQL query?

A) Use the DISTINCT keyword
B) Use the ASC keyword
C) Use the DESC keyword
D) Use the ORDER keyword

2. Which SQL clause can be used in Oracle to limit the number of rows returned?

A) GROUP BY
B) DISTINCT
C) WHERE
D) FETCH FIRST n ROWS ONLY

3. Which command revokes a user's privilege to update a table?

A) REVOKE UPDATE ON table_name FROM user_name;
B) DELETE UPDATE ON table_name FROM user_name;
C) REMOVE UPDATE ON table_name FROM user_name;
D) DENY UPDATE ON table_name FROM user_name;

4. What is the difference between UNION and UNION ALL?

A) UNION includes all rows, while UNION ALL removes duplicates.
B) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
C) UNION works with subqueries, while UNION ALL does not.
D) UNION combines columns, while UNION ALL combines rows.

5. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) The full date in the session time zone
B) An error due to incorrect syntax
C) The current year in the database time zone

Solutions: