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

junior, mid

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.

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