Add DuckDB examples

Author: gjbex

source-code/README.md

@@ -15,6 +15,7 @@ to create it.  There is some material not covered in the presentation as well.
   representation and algorithms.
 * [`pandas`](pandas): illustrations of using pandas and seaborn.
 * [`polars`](polars): Kllustrations of using polars.
+* [`duckdb`](duckdb): illustrations of using DuckDB for SQL queries.
 * [`regexes`](regexes): illustrations of using regular expressions for
   validation and information extraction from textual data.
 * [`seaborn`](seaborn): illustrations of using Seaborn to create plots.

source-code/duckdb/README.md

@@ -0,0 +1,14 @@
+# DuckDB
+
+DuckDB is an in-process SQL OLAP database management system. It is designed to
+support analytical query workloads and is optimized for fast query performance
+on large datasets. DuckDB can be embedded directly into applications, making it
+a popular choice for data analysis tasks in various programming environments.
+
+
+## What is it?
+
+1. `patients.ipynb`: A Jupyter notebook that demonstrates how to use DuckDB for
+   analyzing patient data. It includes examples of loading data and executing
+   SQL queries.
+1. `data/`: CSV files to use with the notebook.