When comparing EXISTS and IN, which choice is generally safer with NULLs and scalable for large subqueries?

Problem Statement

Explanation

EXISTS stops at the first matching row and is not affected by NULLs in the subquery. It works well with an index on the correlated predicate. IN compares a value to a set. If the subquery can yield NULLs, NOT IN can return no rows due to three-valued logic. Deduplicate the subquery or prefer NOT EXISTS.

Code Solution

SolutionRead Only

SELECT * FROM orders o
WHERE EXISTS (
  SELECT 1 FROM order_items i WHERE i.order_id = o.id
);

Practice Sets

This question appears in the following practice sets:

CTEs, Subqueries & Advanced Joins

Next Question

Master Interviews
Anywhere, Anytime

When comparing EXISTS and IN, which choice is generally safer with NULLs and scalable for large subqueries?

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

When comparing EXISTS and IN, which choice is generally safer with NULLs and scalable for large subqueries?

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