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Home/Questions/General/Other/Describe your approach to managing data deduplication.

Describe your approach to managing data deduplication.

General/Othermedium0.5 min readPremium

Frequency

Low

Asked at 1 company

Category

243

questions in General/Other

Difficulty Split

151E|43M|49H

in this category

Total Bank

1,863

across 7 categories

Asked at these companies

Fragma Data Systems

Key Concepts Tested

partition window

Expert AnswerPremium

91 wordsInterview-ready

**Architectural Logic**: Deduplication is layered—at ingest (constraints/upserts), batch (deterministic selection), and stream (exactly-once semantics with dedup windows). **Why Layered**: Ingest prevents duplicates early; batch handles historical drift; stream semantics handle retries and late arrivals. **Implementation**: Use MERGE/INSERT OVERWRITE with dedup keys; ROW_NUMBER() OVER (PARTITION BY key ORDER BY updated_at DESC) for batch; event IDs + content hashes for idempotency....

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