SQL Proficiency and Application | Dataford Interview Questions

How would you assess your current SQL skill level and why?

For this practical assessment, demonstrate your answer with a PostgreSQL query using the supplied policyholder and claim data. The result should show how you handle missing relationships, conditional claim inclusion, aggregation, and comparative ordering.

Output

One row per policyholder, including policyholders without qualifying claims.
Columns: policyholder_name, risk_segment, claim_count, total_claim_amount, and segment_rank.
Include only claims dated in 2025 with status Open or Closed.
Order by risk_segment, segment_rank, then policyholder_name.

Schema

policyholders

Column	Type	Description
policyholder_idPK	INT	Unique policyholder identifier
policyholder_name	VARCHAR(100)	Policyholder display name
risk_segment	VARCHAR(30)	Risk classification for the policyholder

claims

Column	Type	Description
claim_idPK	INT	Unique claim identifier
policyholder_id	INT	Policyholder associated with the claim
claim_date	DATE	Date the claim was recorded
status	VARCHAR(20)	Current claim status
claim_amount	NUMERIC(12,2)	Claim amount

Your question is SQL Proficiency and Application. Start with the requirements and the two tables in the Question tab.

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Problem