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Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following SET operators combines results from two queries and removes duplicates?

A) UNION
B) UNION ALL
C) MINUS
D) INTERSECT

2. What does the NEXTVAL pseudocolumn do in SQL?

A) Deletes the sequence from the database
B) Retrieves the next value in a sequence and increments the sequence
C) Resets the sequence to its starting value
D) Retrieves the current value of a sequence without incrementing it

3. What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;

A) 15.678
B) 15.6
C) 15.68
D) 15.67

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

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

5. What will the following SQL statement output?
SELECT first_name || ' ' || last_name AS full_name FROM employees;

A) Concatenated first and last names with spaces in between
B) A syntax error
C) Concatenated first and last names without spaces
D) Only the first names of employees

Solutions: