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Oracle Database 23ai SQL Associate Sample Questions:

1. Which command would drop an index from a table?

A) DELETE INDEX
B) TRUNCATE INDEX
C) REMOVE INDEX
D) DROP INDEX

2. Which type of join includes rows that do not have matching values in the joined table?

A) CROSS JOIN
B) OUTER JOIN
C) INNER JOIN
D) SELF JOIN

3. Which of the following ensures that a relational database enforces data integrity?

A) Hierarchical data organization
B) Indexes on all columns
C) Redundant data storage
D) Constraints such as primary keys, foreign keys, and unique constraints

4. Which command is used to add a new column to an existing table?

A) ALTER COLUMN
B) ALTER TABLE
C) ADD COLUMN
D) MODIFY COLUMN

5. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) All department IDs from the employees table
B) Department IDs that exist in both the departments and employees tables
C) All department IDs from the departments table
D) Department IDs that exist only in the employees table

Solutions: