Distinct Chat Conversations

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

How many unique conversations exist in chat_msgs? Two users share one conversation regardless of who sent first, so (A,B) and (B,A) count as the same conversation. Return a single count.

Summary

How many unique conversations?

Practice This Problem

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