SQL, DSA, and Trees/DP | Dataford Interview Questions

How would you approach a data engineering interview that includes SQL and data modeling, plus DSA focused on linked lists, trees, and dynamic programming?

For the SQL and data-modeling portion, use the provided relational model to summarize topic coverage across the listed interview areas.

Output

Return one row per topic, including topics with no active questions.
Return topic_name, track, active_question_count, avg_minutes, and readiness.
Count only active questions, replace missing averages with 0.0, and order by the topic display order.

Schema

interview_topics

Column	Type	Description
topic_idPK	INT	Unique topic identifier
topic_name	VARCHAR(100)	Interview topic name
track	VARCHAR(50)	Interview track containing the topic
display_order	INT	Required presentation order

interview_questions

Column	Type	Description
question_idPK	INT	Unique question identifier
topic_id	INT	Associated topic identifier
question_title	VARCHAR(150)	Question title
estimated_minutes	INT	Estimated completion time
is_active	BOOLEAN	Whether the question currently counts toward coverage

Your question is SQL, DSA, and Trees/DP. Start with the requirements and the two tables in the Question tab.

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Problem