Summarize Operations Issues by Source | Dataford Interview Questions

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The question is on your right: Summarize Operations Issues by Source. Read through the requirements and the three tables first.

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Problem

Acme Manufacturing tracks operational issues by source system. Write a PostgreSQL query to summarize issue volume and resolution speed for sources that currently have at least one open issue.

Requirements

Return one row per source_name.
Show the count of open issues as open_issue_count.
Show the count of open high-severity issues as high_open_issue_count.
Show the average number of days to resolve closed issues as avg_resolution_days, rounded to 1 decimal place.
Include only sources with at least one open issue.
Order results by open_issue_count descending, then source_name ascending.

Schema

issues

Column	Type	Description
issue_idPK	INT	Primary key for each issue
source_id	INT	Foreign key to the issue source
severity	VARCHAR(20)	Severity label such as low, medium, or high
status	VARCHAR(20)	Issue status such as open or closed
created_at	DATE	Date the issue was created
resolved_at	DATE	Date the issue was resolved, if closed

issue_sources

Column	Type	Description
source_idPK	INT	Primary key for the issue source
source_name	VARCHAR(50)	Human-readable source name

daily_activity

Column	Type	Description
activity_idPK	INT	Primary key for the activity row
issue_id	INT	Foreign key to the issue
activity_date	DATE	Date of the activity
minutes_spent	INT	Minutes spent on the issue that day