Average Initial Call Latency

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

The performance team is measuring first-impression latency across the platform. Each user's earliest API call (by timestamp) is their initial call. Compute the average latency across all users' initial calls and return a single value.

Summary

First contact latency. The benchmark.

Practice This Problem

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