Which option best describes a correlated subquery?

Problem Statement

Explanation

A correlated subquery depends on the current row of the outer query. The database must re-evaluate it for each outer row. This design is expressive, but can be slow if the inner expression is not selective or not indexed. Many engines can transform it into a join when the logic allows.

Code Solution

SolutionRead Only

SELECT e.emp_id
FROM employees e
WHERE e.salary > (
  SELECT AVG(salary)
  FROM employees x
  WHERE x.dept_id = e.dept_id
);

Practice Sets

This question appears in the following practice sets:

Subqueries & CTEs (incl. Recursive)

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Which option best describes a correlated subquery?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

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Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews Anywhere, Anytime

Which option best describes a correlated subquery?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime