DuckDB Parquet Lab Workflow

Purpose

Standardize the pattern of loading Parquet files into DuckDB, inspecting schema, running SQL joins, and converting results to pandas DataFrames.

Usage

• "load Parquet with DuckDB and join tables"
• "describe DuckDB table schema"
• "convert DuckDB query to pandas"

Instructions

1. Read Parquet data with duckdb.query or duckdb.sql using SQL strings.
2. Inspect schema using DESCRIBE SELECT * FROM <table> and display with .show().
3. Use explicit joins with clear LEFT or RIGHT semantics to preserve row counts.
4. Convert results to pandas with .to_df() for downstream modeling.
5. Use ./templates/duckdb_snippets.md for the standard SQL patterns.