In SQL Server, to represent floating piont numbers, you can use float or real. Refer https://learn.microsoft.com/en-us/sql/t-sql/data-types/float-and-real-transact-sql?view=sql-server-ver16
In your example, see the below query to create a table with real data type.
CREATE TABLE Items (PLACE varchar ,ValueA decimal,ValueB decimal,ValueC real);
So your code can be
SqlCommand command = new SqlCommand("CREATE TABLE Items (PLACE varchar ,ValueA decimal,ValueB decimal,ValueC real); ", conn);
since you are using varchar for place, it will create varchar(1), means your place can store only one char. If you are planning to store more characters in place, use your query as below.
CREATE TABLE Items (PLACE varchar(200) ,ValueA decimal,ValueB decimal,ValueC real);
Hope this helps