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Oracle Database 23ai SQL Associate Sample Questions:

1. What happens if a DELETE statement is executed without a WHERE clause?

A) Only the first row is deleted.
B) No rows are deleted.
C) All rows in the table are deleted.
D) An error is raised.

2. What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);

A) Employees with no department
B) Departments located in location ID 1000
C) Employees with salaries greater than 1000
D) Employees working in location ID 1000

3. What is the purpose of a correlated subquery?

A) A subquery that can be used only with aggregate functions
B) A subquery that combines data from multiple tables
C) A subquery that references columns from the outer query
D) A subquery that depends on the result of another subquery

4. How does SQL handle NULL values in arithmetic expressions?

A) Treats them as the largest possible number
B) Produces an error
C) Produces a NULL result
D) Treats them as zero

5. What is a SELF JOIN in SQL?

A) A join between tables with identical structures
B) A join that does not require a WHERE clause
C) A join used for Cartesian products
D) A join of a table with itself

Solutions: