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

Domain

SQL

Difficulty

hard

Seniority

L5

Problem

Does pipeline throughput correlate with duration? For each pipeline, calculate the average duration and the average net row output (rows_out minus 10% of rows_in as overhead). Then compute the correlation between average duration and average net output across all pipelines, rounded to 2 decimals. Return a single correlation value.

Summary

Does throughput correlate with duration?

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