# A customer's address changes

Canonical URL: <https://datadriven.io/problems/a-customers-address-changes-the-current-pipeline-overwrite-442ce584>

Domain: Pipeline Design · Difficulty: medium

## Problem

A customer's address changes. The current pipeline overwrites it, so a report run for last quarter now shows the new address and the historical numbers are wrong. Design the dimension load so history is preserved.

## Related

- [All practice problems](https://datadriven.io/problems)
- [Mock interview mode](https://datadriven.io/interview/a-customers-address-changes-the-current-pipeline-overwrite-442ce584)
- [System Design Interview Questions](https://datadriven.io/data-engineering-system-design)
- [Data Engineering Interview Prep Guide](https://datadriven.io/data-engineer-interview-prep)
- [Daily Challenge](https://datadriven.io/daily)

---

Source: DataDriven (https://datadriven.io). 100% free data engineering interview prep. Live code execution against Postgres 16, Python 3.11, and Spark sandboxes. No paywall, no premium tier, no signup gate.