> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lancedb.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Feature engineering 101

> Add derived feature columns to an existing table.

Adds new derived features to a table, the pattern documented under
[computed columns](https://docs.lancedb.com/feature-engineering/add-computed-column.md).

> [!NOTE]
>
> This example is a runnable notebook in the
> [vectordb-recipes](https://github.com/lancedb/vectordb-recipes) repository rather than a page here.

> [card] [Open in Colab](https://colab.research.google.com/github/lancedb/vectordb-recipes/blob/main/tutorials/feature-engineering/feature-engineering-101.ipynb)
>
> Run it end to end in the browser.

> [card] [View on GitHub](https://github.com/lancedb/vectordb-recipes/tree/main/tutorials/feature-engineering/feature-engineering-101.ipynb)
>
> Read the source.


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