---
title: "Discussion on \"Identity dedup in a medallion lakehouse: the nulls no one catches\" | Hashnode"
description: "Discussion on \"Identity dedup in a medallion lakehouse: the nulls no one catches\". 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"
url: "https://hashnode.com/posts/identity-dedup-in-a-medallion-lakehouse-the-nulls-no-one-catches/6a53c491db7ec1353c05a4b2"
---

[Feed](https://hashnode.com/feed) /

Discussion

# [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

Jul 12 · 8 min read · sapotacorpvn.hashnode.dev  
Read the article

-   [#aws](https://hashnode.com/tag/aws)
-   [#data-engineering](https://hashnode.com/tag/data-engineering)
-   [#data-deduplication](https://hashnode.com/tag/data-deduplication)
-   [#medallion-architecture](https://hashnode.com/tag/medallion-architecture)
-   [#data-quality](https://hashnode.com/tag/data-quality)

## Written by

[SapotaCorp](https://hashnode.com/@sapotacorpvn)

@sapotacorpvn · Hanoi, Vietnam

  
[View profile](https://hashnode.com/@sapotacorpvn)

## Responses

Markdown supported · ⌘↵ to post

No responses yet.