Top 5 Slowest DNS Lookups

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

Domain

SQL

Difficulty

easy

Seniority

junior, mid

Problem

We are investigating DNS performance. Find the top 5 unique domain and record type pairs by their maximum latency. If pairs tie at the cutoff, include all of them. Rank from longest to shortest.

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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.