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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What is the default order of evaluation when multiple SET operators are used in a query?

A) INTERSECT, UNION, MINUS
B) UNION, MINUS, INTERSECT
C) UNION, INTERSECT, MINUS
D) INTERSECT, MINUS, UNION

3. Which of the following data dictionary views provides information about constraints on tables?

A) ALL_CONSTRAINTS
B) DBA_CONSTRAINTS
C) All of the above
D) USER_CONSTRAINTS

4. Which clause in a SQL SELECT statement is used to define the columns to be retrieved?

A) SELECT
B) WHERE
C) FROM
D) GROUP BY

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

Solutions: