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Summarize BigQuery Runs by Project
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Summarize BigQuery Runs by Project

MediumSQL · PostgreSQL

Problem

Tell me about your SQL skills and how you use tools like BigQuery in past projects or internships.

Demonstrate your answer by summarizing project query activity from the provided tables. Include only projects with at least one BigQuery run and at least two successful runs.

Output

  1. One row per qualifying project, with project_name, total_runs, successful_runs, success_rate, and avg_duration_seconds
  2. Sort by success_rate descending, average duration ascending, then project_name ascending

Output details

  • Treat a run as successful only when status equals succeeded.
  • Treat a run as a BigQuery run only when tool_name equals BigQuery.
  • Report success_rate as the successful-run percentage, rounded to 2 decimal places.
  • Round avg_duration_seconds to 2 decimal places.

Schema

projects
ColumnTypeDescription
project_idPKINTUnique project identifier
project_nameVARCHAR(100)Project name
query_runs
ColumnTypeDescription
run_idPKINTUnique query run identifier
project_idINTProject associated with the run
tool_nameVARCHAR(50)SQL or analytics tool used for the run
run_dateDATEDate when the query ran
statusVARCHAR(20)Run outcome
duration_secondsDECIMAL(10,2)Query duration in seconds
Tablesprojectsquery_runs
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