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Oracle Database 23ai SQL Associate Sample Questions:

1. How are NULL values treated in relational databases?

A) NULL values represent missing or unknown data.
B) NULL values are treated as empty strings.
C) NULL values are treated as zero.
D) NULL values are not allowed in relational databases.

2. Which statement can be used to undo changes made in a transaction?

A) COMMIT
B) MERGE
C) ROLLBACK
D) SAVEPOINT

3. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

A) CROSS JOIN
B) NATURAL JOIN
C) EQUI JOIN
D) OUTER JOIN

4. What is the purpose of the MERGE statement in SQL?

A) To join two tables into one
B) To combine the results of two queries
C) To delete duplicate rows from a table
D) To update existing rows or insert new rows in a target table

5. What is a sequence in Oracle Database?

A) A database object that generates a series of unique numeric values
B) A predefined set of SQL queries executed in order
C) A list of numbers stored in a table
D) A type of index used for sorting rows

Solutions: