From users, return user_id and COALESCE(age_bucket, 'unknown') AS age_group

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Problem

From users, return user_id and COALESCE(age_bucket, 'unknown') AS age_group. Group by age_group and count users_in_group. Order by users_in_group DESC, age_group.

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.