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Oracle Database 23ai SQL Associate Sample Questions:

1. How can a synonym benefit database design?

A) It enforces constraints on table columns.
B) It provides a consistent reference to database objects, even if their underlying names change.
C) It allows the renaming of columns in a table.
D) It improves query execution time.

2. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;

A) Deletes the employees table
B) Sets the salary column to NULL for all rows
C) Drops the salary column from the employees table
D) Removes duplicate rows from the employees table

3. What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;

A) Employees who do not have managers
B) All employees and their IDs
C) Employees who have managers
D) Employees and their managers' IDs

4. What does the following query return?
SELECT ROUND(123.456, 1) AS rounded_value FROM dual;

A) 123.5
B) 123.4
C) 123.45
D) 124

5. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Delete all rows where department_id is 20
B) Delete all rows in the employees table
C) Raise an error because DELETE cannot use a WHERE clause
D) Delete the department_id column in the employees table

Solutions: