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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) FULL OUTER JOIN
B) RIGHT
C) LEFT
D) CROSS

2. Which SQL function can be used to replace NULL values with a specified value?

A) COALESCE
B) NVL
C) ISNULL
D) REPLACE

3. Which data dictionary view lists all indexes created by the current user?

A) DBA_INDEXES
B) ALL_INDEXES
C) INDEX_LIST
D) USER_INDEXES

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

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

5. What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;

A) Retrieves all employees, sorted by department ID
B) Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
C) Retrieves employees with salary less than 5000, sorted by department ID
D) Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order

Solutions: