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

Domain

SQL

Difficulty

medium

Problem

Count click events (clicked = 1) per date for Friday impressions (day-of-week 5), restricted to users who have posted at least once in chat_msgs. Return the date (YYYY-MM-DD) and the count, sorted by date ascending.

Summary

The busiest route by volume.

Practice This Problem

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