SQL Bottlenecks by Team and Week | Dataford Interview Questions

Private Practice wants to identify operational bottlenecks that take the longest to resolve. Write a PostgreSQL query that summarizes resolved cases by team, calendar week, and bottleneck type, then returns the five groups with the highest average resolution time.

Requirements

Join operational_cases to teams and group results by team, week, and bottleneck type.
Include only resolved cases with non-null timestamps and bottleneck types.
Calculate average resolution time in hours and the number of resolved cases in each group.
Return the five highest averages, using a deterministic tie-breaker after sorting by average resolution time descending.

Representative Data

Schema

teams

Column	Type	Description
team_idPK	INT	Unique operations team identifier
team_name	VARCHAR(100)	Private Practice operations team name

operational_cases

Column	Type	Description
case_idPK	INT	Unique operational case identifier
team_id	INT	Assigned operations team identifier
bottleneck_type	VARCHAR(100)	Category describing the operational bottleneck
created_at	TIMESTAMP	Timestamp when the case was created
resolved_at	TIMESTAMP	Timestamp when the case was resolved
status	VARCHAR(20)	Current case status

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Problem