A lightweight Windows desktop SQL query tool powered by DuckDB. DuckSQL makes it easy to query data files (Parquet, CSV, JSON, XLSX, and more) using SQL without the need for a traditional database server.

• Query Multiple File Formats: Execute SQL queries directly against Parquet, CSV, JSON, Excel, and other data files
• In-Memory Processing: Leverages DuckDB's high-performance in-memory analytics engine
• Multi-Tab Interface: Work with multiple queries simultaneously in separate tabs
• Syntax Highlighting: SQL syntax highlighting for better code readability
• Quick Results: View query results in a customizable data grid
• Export Results: Save query results to CSV, Excel, or JSON format
• Drag & Drop Support: Simply drag files or folders into the application to start querying

Download the latest release from the Releases page

Also check out our User Guide

1. Open a data file: Go to File > Open Data File or drag & drop a file into the window

• Supported data file types: csv, parquet, xlsx, json

2. Write your query: Enter SQL in the query editor

   SELECT *
   FROM 'your-file.parquet'
   LIMIT 100

3. Execute: Press F5 or click the Execute button
4. View results: Results appear in the grid below the query editor

Query a Parquet file:

SELECT column1, column2, COUNT(*)
FROM 'data.parquet'
GROUP BY column1, column2
ORDER BY COUNT(*) DESC

Query a CSV file:

SELECT *
FROM 'data.csv'
WHERE column1 > 100

Query multiple files:

SELECT *
FROM 'folder/*.parquet'
WHERE date >= '2024-01-01'

Users can opt-in to share anonymous usage data to help make the app better. ¹

Contributions are welcome! Please feel free to submit issues or pull requests.