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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

The data quality team flagged stale records in a dimension table. Identify users who had zero sessions between June 1 and July 1, 2026. Include both users who were active outside that window and users who never had any sessions at all.

Summary

Ghost accounts. Active signup, zero sessions.

Practice This Problem

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