> ## Documentation Index
> Fetch the complete documentation index at: https://parabola.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Combining data
In this lesson, you'll learn the three methods for combining data in Parabola — joining on shared IDs, stacking tables, and comparing tables to find overlap.
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Now that your sales data is clean, bring in the product category information so you can break Total Sales down by category.
```text wrap theme={null}
Join my sales data with my product categories on "SKU".
```
The join step should live outside of any card, connected directly to the outputs of both pull steps.
The steps added to your canvas and their exact documentation may differ from what you see below — every AI response is unique. The important thing is that your resulting data set matches what you see here.
