Unique Reporters per Content

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

In the chat data, each message can be a reply to content. For each content reference, count unique reporters identified by combining sender and channel. Only count messages that are replies (reply_to is not null). Return the content ID and the reporter count.

Summary

How many people flagged each item?

Practice This Problem

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