How can I load data from a Unity Catalog volume into a table in Databricks SQL using the COPY INTO command?
To load data from a Unity Catalog volume into a table in Databricks SQL using the COPY INTO command, you must have the READ VOLUME privilege on the volume. Here's an example of how to use the COPY INTO command with a volume path:

```sql
COPY INTO landing_table 
FROM '/Volumes/quickstart_catalog/quickstart_schema/quickstart_volume/raw_data' 
FILEFORMAT = PARQUET;
```

In this example, `landing_table` is the target table in Databricks SQL, and the source data is located in the `quickstart_catalog` volume under the `raw_data` directory. The `FILEFORMAT` parameter specifies the file format of the source data, which is Parquet in this case.

Optionally, you can also use a volume path with the `dbfs` scheme, like this:

```sql
COPY INTO landing_table 
FROM 'dbfs:/Volumes/quickstart_catalog/quickstart_schema/quickstart_volume/raw_data' 
FILEFORMAT = PARQUET;
```

This command is equivalent to the previous one, but it uses the `dbfs` scheme to specify the volume path.

Note that volume privileges apply to all nested directories under the specified volume, so you can use a volume path with any nested directories under the volume. For example, if you have access to the `quickstart_volume` volume, you can also use the following command to load data from the `json` directory:

```sql
COPY INTO json_table 
FROM '/Volumes/quickstart_catalog/quickstart_schema/quickstart_volume/raw_data/json' 
FILEFORMAT = JSON;
```

In this example, `json_table` is the target table in Databricks SQL, and the source data is located in the `json` directory under the `raw_data` directory. The `FILEFORMAT` parameter specifies that the source data is in JSON format.