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A nested subquery in SQL is a subquery placed inside another query, often in the WHERE, FROM, or SELECT clause. It helps break down complex queries into manageable parts and allows stepwise data filtering and transformation.
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What is a nested subquery?
Which clause commonly contains nested subqueries?
Which of the following is a valid nested subquery?
SELECT name
FROM employees
WHERE department_id = (
SELECT id
FROM departments
WHERE name = ‘Sales’
);
What happens if a nested subquery returns more than one row and is used with = operator?
What SQL operator is used to handle multiple values from a nested subquery?
Can nested subqueries be multi-level (i.e., subquery inside subquery)?
What does this query return?
SELECT name
FROM employees
WHERE salary > (
SELECT AVG(salary)
FROM employees
WHERE department_id = (
SELECT id
FROM departments
WHERE name = ‘Marketing’
)
);
What is required for a nested subquery to be valid in the `SELECT` clause?
Can you use nested subqueries inside the `FROM` clause?
What is the purpose of using a nested subquery?
Which keyword works best with nested subqueries that return TRUE/FALSE?
Which is better for performance in large data sets?
What is the result if a nested subquery returns no rows and is used with IN?
What does this query return?
SELECT name
FROM students
WHERE id IN (
SELECT student_id
FROM enrollments
WHERE course_id IN (
SELECT id FROM courses WHERE name = ‘SQL Basics’
)
);
What should you ensure when using `=` with a subquery?
A nested subquery lets you run queries within queries, making SQL code modular and readable. While powerful, care must be taken to use proper operators (`=`, `IN`, `EXISTS`) based on the number of rows returned by the subquery.
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