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

# Selected Device Mapping

If you do decide to select to define the mapping for either data or indexes, you may do so. If you define one and not the other, Regatta will complete the definition for you. For example, if you do map the table to some devices but not decaler where an indexed key should go, Regatta will select a random device and map the index to it.

The first command should display the devices that are used in the cluster. We enter SHOW DEVICES in the WebCLI command line:

```SQL theme={null}
SHOW DEVICES
```

The next command will be the CREATE TABLE command. This command will look as follows
(note the usage of the devices). Let’s create a similar table called **workers.** Enter the following
command:

```SQL theme={null}
CREATE TABLE workers (
 worker_key INT PRIMARY KEY INDEX WITH (devices = (m10d1)),
 worker_name VARCHAR(40) NOT NULL,
 worker_salary INT,
 worker_department VARCHAR(50) NOT NULL)
WITH (devices = (m10d1))
```

Running it will create the desired table.

Enter the SQL show tables command:

```SQL theme={null}
SHOW TABLES
```

We can see the table with all the columns and the device mapping. Note that in the **workers** table, the data is only mapped once to the device since this is what we chose as opposed to **employees** where Regatta mapped it 3 times.

We will continue here using the **employees** table.