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

# Data

> View and manage your tables and data catalog.

The **Data** page is where you view and manage your tables and catalog. Browse your connected data, create new tables with SQL, and enrich your catalog so [Addison](/features/addison) better understands your data.

## Source tables

Source tables represent data from your [connections](/features/connectors) — warehouses, databases, uploaded files, and more. They're read-only and reflect the data as it exists in the source.

<Warning>
  Screenshot needed: Source tables view on the Data page
</Warning>

## Calc tables

Calc tables are custom tables you create using SQL. Use them to combine, filter, or reshape your source data into the format you need for analysis.

```sql theme={null}
-- Example: monthly revenue summary
SELECT
  DATE_TRUNC('month', order_date) AS month,
  region,
  SUM(revenue) AS total_revenue
FROM source_orders
GROUP BY 1, 2
```

<Warning>
  Screenshot needed: Creating a calc table
</Warning>

## Catalog

The catalog describes your data — table names, column definitions, and business context. It has two layers:

* **Automatic** — populated when you connect a data source. Includes column names, types, and source information.
* **Enriched** — descriptions, business definitions, and context. Generated by AI and editable by you.

The catalog powers Addison's understanding of your data. The more complete your catalog, the better Addison's results.

<Warning>
  Screenshot needed: Catalog view showing table and column descriptions
</Warning>

### Editing the catalog

You can edit catalog entries to add or correct:

* Table descriptions — what the table contains and when to use it
* Column definitions — what each field means, including example values
* Relationships — how tables connect to each other

## Views

Views let you reshape a table's presentation with filtering, grouping, and cross-tabulation — without creating a new table.