# domains

```
domains
```

The `domains` view provides information about all domains defined in Lunar. Domains represent logical groupings of components that share similar characteristics or purposes.

## Schema

| Column        | Type    | Description                                                                            |
| ------------- | ------- | -------------------------------------------------------------------------------------- |
| `name`        | `TEXT`  | The identifier for the domain in hierarchical dotted format (e.g. `payments.checkout`) |
| `description` | `TEXT`  | A description of the domain                                                            |
| `owner`       | `TEXT`  | The owner of the domain                                                                |
| `meta`        | `JSONB` | Arbitrary metadata associated with the domain                                          |

## Notes

* Domains are defined primarily in the Lunar configuration but can also come from catalogers
* Domains can be used to organize and categorize components
* Components can be assigned to specific domains to create logical groupings
* Domains can be hierarchical, with a parent-child relationship represented by a dotted notation. For example, in the domain name `auth.sso.providers`, `auth` is the parent domain of `auth.sso`, and `auth.sso` is the parent domain of `auth.sso.providers`. The full domain name is stored in the `name` column using dotted notation.

## Usage examples

List all domains in the system:

```sql
SELECT *
FROM domains
ORDER BY name;
```

Find domains owned by a specific person or team:

```sql
SELECT *
FROM domains
WHERE owner = 'platform-team@example.com';
```

Get a count of components by domain:

```sql
SELECT 
  d.name AS domain_name,
  COUNT(c.name) AS component_count
FROM domains d
LEFT JOIN components c ON c.domain = d.name
GROUP BY d.name
ORDER BY component_count DESC;
```

Find all subdomains of a specific parent domain:

```sql
SELECT *
FROM domains
WHERE name LIKE 'payments.%'
ORDER BY name;
```

Find the direct subdomains of a specific domain (only one level down):

```sql
SELECT *
FROM domains
WHERE name LIKE 'payments.%'
  AND name NOT LIKE 'payments.%.%'
ORDER BY name;
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs-lunar.earthly.dev/sql-api/views/domains.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.