alloy-notebooks 0.4.2

Multi-language notebook extension for JupyterLab with SQL, charting, and cross-language data sharing

Alloy Notebooks

Multi-language notebooks for JupyterLab -- write SQL, Python, and R in the same notebook with seamless data sharing between languages.

Built as a replacement for Azure Data Studio's notebook experience, which was retired in February 2026.

Features

SQL Cells with Inline Results

• Set any cell to SQL using the unified dropdown (Python | SQL | R | Markdown | Raw)
• SQL syntax highlighting
• Results rendered as interactive tables with row counts
• Click Chart to see value-count bar charts for each column -- no code needed
• Click Configure Chart for custom visualizations (bar, line, scatter, pie, area, histogram)

Connection Manager

• Sidebar panel to save and manage database connections
• Supports SQL Server, PostgreSQL, MySQL, SQLite, DuckDB
• Auto-detects installed ODBC drivers
• Windows Authentication and SQL Authentication
• Connections persist across sessions (~/.alloy/connections.json)

DuckDB Cells — Query DataFrames with SQL

• Set any cell to DuckDB in the dropdown
• Write SQL that queries your pandas DataFrames as if they were tables
• JOIN across DataFrames, use window functions, CTEs — full SQL power
• Results saved as _alloy_last_result or via -- save as: varname
• No database connection needed — DuckDB runs in-process
• Can also read Parquet/CSV files: SELECT * FROM 'data.parquet'

Multiple Database Connections

• Connect to multiple databases simultaneously (SQL Server, PostgreSQL, MariaDB, etc.)
• Each connection gets a named alias
• Target specific connections with -- connection: alias in SQL cells
• Sidebar shows all active connections with green indicators
• Auto-reconnects all connections when the kernel restarts

Cross-Language Data Sharing

• SQL results automatically available as pandas DataFrames in Python
• Name your results with -- save as: my_data in SQL cells
• R cells automatically receive only the Python variables they reference (smart transfer)
• New R variables (data.frames) automatically come back to Python after execution
• Uses Apache Arrow for near-zero-copy transfers when pyarrow + rpy2-arrow are installed (~425x faster than pandas2ri)
• %alloy_vars magic to list all available DataFrames

Language Icons

• Small language icons (Python, SQL, R, Markdown) on the left margin of each cell
• Toggleable via Settings > Alloy Notebooks > "Show language icons"

Unified Cell Type Dropdown

• Single dropdown replacing JupyterLab's Code/Markdown/Raw and a separate language selector
• Options: Python | SQL | R | Markdown | Raw
• Switching languages updates syntax highlighting instantly

Install

From PyPI (recommended)

pip install alloy-notebooks

From GitHub (latest development version)

pip install git+https://github.com/Columbia-Data-Labs/alloy-notebooks.git

Optional dependencies

For SQL Server connections:

pip install pyodbc

For R support:

pip install rpy2

For fast data transfer between Python and R (near-zero-copy via Apache Arrow):

pip install pyarrow rpy2-arrow

Quick Start

1. Install: pip install alloy-notebooks
2. Start JupyterLab: jupyter lab
3. Connect: Click "Alloy" in the left sidebar, add a database connection
4. Write SQL: Create a cell, select "SQL" from the dropdown, write a query, run it
5. See results: Table with Chart button appears below the cell
6. Use in Python: Results are in _alloy_last_result, or use -- save as: my_df to name them
7. Use in R: Switch a cell to "R", reference your DataFrame by name -- it transfers automatically

Example Workflow

SQL cell (default connection):

-- save as: orders
SELECT customer_name, product, quantity, price
FROM sales.orders
WHERE order_date > '2026-01-01'

SQL cell (specific connection):

-- connection: nas
-- save as: backups
SELECT * FROM backup_logs ORDER BY created_at DESC

DuckDB cell (query DataFrames with SQL — no database needed):

-- save as: top_customers
SELECT customer_name, SUM(quantity * price) as revenue
FROM orders
GROUP BY customer_name
ORDER BY revenue DESC
LIMIT 10

Python cell:

# 'orders' and 'top_customers' are both pandas DataFrames
orders['total'] = orders['quantity'] * orders['price']
print(orders.describe())

R cell:

# 'orders' transfers automatically -- only this variable, not everything
summary(orders)
model <- lm(total ~ quantity, data = orders)
summary(model)

Python cell:

# 'model' created in R is available if it's a data.frame
# Use %alloy_vars to see all available DataFrames
%alloy_vars

Platform Support

Works on Windows, Linux, and macOS. R and ODBC driver paths are auto-detected per platform.

Requirements

• JupyterLab >= 4.0.0
• Python >= 3.10

Database drivers

Database	Package	Notes
SQL Server	pyodbc	Windows: ODBC Driver 17/18. Linux/Mac: unixodbc + Microsoft ODBC driver or FreeTDS
PostgreSQL	psycopg2	pip install psycopg2-binary
MySQL/MariaDB	pymysql	pip install pymysql
SQLite	(built-in)	No extra install needed
DuckDB	duckdb	pip install duckdb

SQL Server on Linux/Mac

# Ubuntu/Debian
curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
sudo apt-get install -y msodbcsql18 unixodbc-dev
pip install pyodbc

# macOS (Homebrew)
brew install unixodbc microsoft/mssql-release/msodbcsql18
pip install pyodbc

R integration

• Install R (4.4+) for your platform
• pip install rpy2
• For fast transfers: pip install pyarrow rpy2-arrow
• R_HOME is auto-detected on all platforms

Development

# Clone and install in development mode
git clone https://github.com/Columbia-Data-Labs/alloy-notebooks.git
cd alloy-notebooks
pip install -e ".[dev]"
jlpm install
jlpm build

# Watch for changes
jlpm watch  # in one terminal
jupyter lab  # in another terminal

License

BSD-3-Clause

Acknowledgments

Inspired by Azure Data Studio notebooks and built on top of JupySQL for SQL execution.