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A scalar subquery is a subquery that returns exactly one value (one row and one column). These are often used in SELECT, WHERE, or CASE expressions to dynamically fetch single values during query execution.
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What is a scalar subquery in SQL?
Where can a scalar subquery be used?
Which of the following is a valid scalar subquery example?
SELECT name, (SELECT MAX(salary) FROM employees) AS max_salary FROM departments;
What will happen if a scalar subquery returns more than one row?
Which clause CANNOT contain a scalar subquery?
What does this query return?
SELECT name,
(SELECT COUNT(*) FROM orders WHERE orders.customer_id = customers.id) AS order_count
FROM customers;
Can a scalar subquery reference outer query columns?
Which operator is most appropriate for comparing a scalar subquery result?
What is the result if the scalar subquery returns NULL?
Which of the following statements is TRUE?
What type of subquery is this?
SELECT name
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);
What happens if you use a scalar subquery in a SELECT clause and it returns multiple rows?
Scalar subqueries can be used in: (choose the best answer)
What is the result of this query?
SELECT name,
CASE
WHEN salary > (SELECT AVG(salary) FROM employees) THEN ‘Above Average’
ELSE ‘Below Average’
END AS salary_status
FROM employees;
Which keyword helps you ensure that a scalar subquery returns only one row?
A scalar subquery is a powerful SQL feature that returns a single value, ideal for comparisons and dynamic calculations. Used properly, it enhances query flexibility and performance, especially in SELECT and WHERE clauses.
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