---
title: "#data-deduplication articles | Hashnode"
description: "Explore the latest #data-deduplication articles, tutorials, and guides on Hashnode."
url: "https://hashnode.com/tag/data-deduplication"
---

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# #data-deduplication

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[SapotaCorp](https://hashnode.com/@sapotacorpvn) · [Jul 12](https://hashnode.com/posts/identity-dedup-in-a-medallion-lakehouse-the-nulls-no-one-catches/6a53c491db7ec1353c05a4b2)

### [Identity dedup in a medallion lakehouse: the nulls no one catches](https://sapotacorpvn.hashnode.dev/identity-dedup-in-a-medallion-lakehouse-the-nulls-no-one-catches?utm_source=hashnode&utm_medium=feed)

Moving customer deduplication off an on-prem monolith and into a Bronze/Silver/Gold lakehouse sounds like a straight port. It is not. There is no direct JOIN to lean on, the old "keep the oldest ID" cleanup quietly nulls out half your accou

8 min read · [sapotacorpvn.hashnode.dev](https://sapotacorpvn.hashnode.dev/identity-dedup-in-a-medallion-lakehouse-the-nulls-no-one-catches?utm_source=hashnode&utm_medium=feed)