After Hours API Calls

A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.

Domain

SQL

Difficulty

medium

Seniority

L3

Interview Prompt

The compliance team's 2025 audit expected less overnight and weekend traffic in `api_calls` than it actually saw. Count the calls made that year outside business hours, and return the total as a decimal value.

Summary

The office is dark. The API is not.

How This Interview Works

1. Read the vague prompt (just like a real interview)
2. Ask clarifying questions to the AI interviewer
3. Write and run your SQL against a real database
4. Answer the interviewer's follow-up questions, then get a hire or no-hire decision