From users, return COUNT(*) AS total_users and COUNT(age_bucket) AS with_age on one row; then subtra

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 COUNT(*) AS total_users and COUNT(age_bucket) AS with_age on one row; then subtract to derive missing_age as total_users - with_age, also on the row.

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