How can I create an external location in Databricks SQL with a specific name, URL, and storage credential, while including an optional comment?
You can create an external location in Databricks SQL with a specific name, URL, and storage credential, while including an optional comment using the following SQL command:

```sql
CREATE EXTERNAL LOCATION [IF NOT EXISTS] location_name URL url_str WITH (STORAGE CREDENTIAL credential_name) [COMMENT comment]
```

Replace `location_name` with the name of the location you want to create, `url_str` with the absolute URL of the cloud storage, and `credential_name` with the name of the named credential used to connect to this location. You can also include an optional comment by replacing `comment` with your desired description.

Here's an example:

```sql
CREATE EXTERNAL LOCATION s3_remote URL 's3://us-east-1/location' WITH (STORAGE CREDENTIAL s3_remote_cred) COMMENT 'Default source for AWS external data';
```

In this example, an external location named `s3_remote` is created, which is accessed using the `s3_remote_cred` credential. The optional comment 'Default source for AWS external data' is also included.