# Get SQL Query Metadata

Use the `GET /api/v3/query/{queryId}/metadata` endpoint of the Data 360 Query API to retrieve the output schema for a completed query without fetching data rows. Use this endpoint to inspect column names, types, and nullability before retrieving a large result set, or to validate query output structure in your integration.

## Syntax

- **HTTP Method**: GET
- **Format**: REST
- **URI**: `/api/v3/query/{queryId}/metadata`

## Path Parameters

| Parameter | Type   | Description                                                                                                                    |
| --------- | ------ | ------------------------------------------------------------------------------------------------------------------------------ |
| `queryId` | string | Required. The unique identifier of the query returned from `POST /api/v3/query`. Example: `MTAuMjcuMTgxLjE0OTo3NDg0_1cfc8d35`. |

## Request Headers

| Header          | Value                                                       |
| --------------- | ----------------------------------------------------------- |
| `Authorization` | `Bearer {accessToken}`                                      |
| `Accept`        | `application/json` or `application/vnd.apache.arrow.stream` |

## Response Structure

| Field      | Description                                 |
| ---------- | ------------------------------------------- |
| `metadata` | Object containing column schema information |

## Examples

This example shows a metadata retrieval request and response.

### Request

```http
GET https://{dne_cdpInstanceUrl}/api/v3/query/MTAuMjcuMTgxLjE0OTo3NDg0_1cfc8d35-464c-9185-1f41-3eb638a71f7a/metadata
Authorization: Bearer {accessToken}
```

### Response

```json
{
  "metadata": {
    "columns": [
      { "name": "ssot__PreferredName__c", "type": "varchar", "nullable": true },
      { "name": "ssot__MaritalStatusId__c", "type": "varchar", "nullable": true }
    ]
  }
}
```

### Apache Arrow Response

Set `Accept: application/vnd.apache.arrow.stream` to receive the Arrow schema as a binary IPC stream.

## Notes

- This endpoint returns the schema only and does not return data rows.
- Does not support `waitFor` query parameters.
- Does not return query info in response headers.

## Related Resources

- [Submit SQL Query](/docs/data/data-cloud-query-guide/references/data-cloud-query-api-reference/query-api-v3-post.md)
- [Get SQL Query Status](/docs/data/data-cloud-query-guide/references/data-cloud-query-api-reference/query-api-v3-get-query.md)
- [Query Services Status Codes](/docs/data/data-cloud-query-guide/references/data-cloud-query-api-reference/c360a-api-queryservices-statuscodes.md)