Oracle 1Z1-171 real exam prep : Oracle Database 23ai SQL Associate

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Oracle 1Z1-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return all employees and their salaries
B) Return employees with a salary equal to the average salary
C) Return employees with a salary above the average salary
D) Return employees with a salary below the average salary

2. Which of the following is true about foreign key constraints in SQL?

A) They ensure that a column only contains NULL values.
B) They enforce the uniqueness of values in a column.
C) They define a relationship between two tables.

3. What does the EXISTS operator check in a subquery?

A) If the subquery references the outer query
B) If the subquery contains only unique values
C) If the subquery returns a specific number of rows
D) If the subquery returns any rows

4. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

A) NATURAL JOIN
B) CROSS JOIN
C) OUTER JOIN
D) EQUI JOIN

5. In a relational database, what is a foreign key?

A) A key used to sort data in a specific order
B) A temporary key generated during query execution
C) A key that is used to establish a relationship between two tables
D) A unique identifier for a record in a table

Solutions: