---
title: "Discussion on \"5 SQL window-function traps that show up in data engineering interviews (with runnable DuckDB examples)\" | Hashnode"
description: "Discussion on \"5 SQL window-function traps that show up in data engineering interviews (with runnable DuckDB examples)\". Default frames, ties, LAST_VALUE, filters before windows and sparse moving averages. Five small traps that separate knows SQL from writes correct pipelines."
url: "https://hashnode.com/posts/sql-window-function-interview-traps-duckdb/6acd195ee0e9b327716c900a"
---

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# [5 SQL window-function traps that show up in data engineering interviews (with runnable DuckDB examples)](https://itcraftsman.hashnode.dev/sql-window-function-interview-traps-duckdb?utm_source=hashnode&utm_medium=feed)

Default frames, ties, LAST\_VALUE, filters before windows and sparse moving averages. Five small traps that separate knows SQL from writes correct pipelines.

Oct 12 · 5 min read · itcraftsman.hashnode.dev  
Updated Oct 14  
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-   [#sql](https://hashnode.com/tag/sql)
-   [#data-engineering](https://hashnode.com/tag/data-engineering)
-   [#duckdb](https://hashnode.com/tag/duckdb)
-   [#interview](https://hashnode.com/tag/interview)

## Written by

[IT-Craftsman](https://hashnode.com/@itcraftsman)

@itcraftsman

  
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Freelance Data Engineering & DevOps

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