Which command is used to remove all records from a table, including all spaces allocated for the records that are removed?

The command used to remove all records from a table, including all spaces allocated for the records that are removed, is the TRUNCATE command. Here are the steps to use it:

1. Open your SQL command line interface or your SQL development environment.

2. Connect to the database where the table is located using your credentials.

3. Once you're connected, you can use the TRUNCATE command. The syntax is as follows:

   TRUNCATE TABLE table_name;
   

   Replace "table_name" with the name of your table.

4. Run the command. This will remove all records from the table and free up the space they were using.

Please note that this operation cannot be undone, so make sure you really want to delete all records from the table before running the command.