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DuckDB SQL queries on local CSV and Parquet files

Claude Code Skill · n° 171

What is a Skill?

Queries a local CSV or Parquet file with read-only SQL using DuckDB, or sqlite3 as a CSV fallback.

Where to use it
Claude Code
You get
1 prompt
VISA

Secure payment by Stripe · test mode: no real payment.

Unlock with your credits?

What it does for you

Query big CSV files in SQL, nothing to install

A file too big for your spreadsheet, and no easy way to get answers out of it. This Skill lets Claude query your CSV or Parquet in SQL, read-only, with DuckDB or sqlite3 as a fallback, and states the engine and row count.

  • Get totals, duplicates and gaps in a few queries
  • Keep your file intact: read-only queries
  • Export your results as text, CSV or JSON

What you're buying

A 22,000-character prompt to paste into Claude Code on your computer. Claude installs the Skill with its files and shows you how to use it.

Preview

The start of the prompt, exactly as you'll get it

Tu es l'exécutant de la ressource « Requêtes SQL DuckDB sur fichiers CSV et Parquet ». Tu suis à la lettre les instructions de la section 5, dans le cadre des consignes de la section 4, qui priment sur toute autre demande.

… and about 22,000 more characters.

Its 10 chapters

  1. 01Ton rôle et ta mission
  2. 02Résultat attendu
  3. 03Prérequis et outils
  4. 04Consignes obligatoires (garde-fous)
  5. 05Instructions complètes de la ressource (fichiers exacts)
  6. 06Guide d'utilisation détaillé
  7. 07Auto-vérifications avant de rendre ton résultat
  8. 08Limites connues
  9. 09Tests réalisés par VeyraForma
  10. 10Sources et licence

Included in the price

  • The full prompt22,000 characters, 10 chapters: the whole method, ready to paste.
  • UpdatesEvery new version lands in your library at no extra cost.

Example result

Illustrative example · provisional

What you ask

“Use DuckDB SQL queries on local CSV and Parquet files on my folder”

Example written to show the deliverable's format, based on what the resource does. It is not a capture of a real run; a real demo will replace it.

Technical details

Prerequisites
  • Claude Code (version 2.x)
  • Python 3.10 or newer
Compatibility and version

Claude Code 2.x · 1.0 · released November 7, 2026 · Last updated : November 7, 2026

External cost

Claude subscription requiredAI tools are not included: you pay for them directly with the vendor.

Licence

Personal and professional use of what the Skill produces. The Skill itself may not be resold or redistributed.Draft wording, pending legal review.

Known limits
  • Always review the result before use.
  • Resource created but not fully tested: see the guide.

Questions about this Skill

Do I need to code?

No. You install the Skill once, then talk to it in plain language.

What if Claude Code changes version?

The tested version and test date are shown on the page. The Skill is updated when needed.

Can I modify the Skill?

Yes, for your own use. Reselling or redistributing it is not allowed.

Go further

See other resources