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

Domain

SQL

Difficulty

easy

Seniority

L3

Problem

The growth team needs a daily active user (DAU) time series. Count the unique users who had at least one session each calendar day, listed chronologically.

Summary

One metric by day, one by week. Same users, different lenses.

Practice This Problem

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