Dropping unknown foreign key constraints in SQL server

A few years ago, I wrote a blog post about scripting the drop of unknown default constraints in SQL server. Today, I came across a similar problem but with unnamed foreign key constraint. Below is the SQL command needed for find the name of a foreign key constraint given the table and column names.

declare @fc_name varchar(max)
select @fc_name = o.name from sys.tables t
    join sys.foreign_key_columns fk
		on fk.parent_object_id = t.object_id
    join sys.columns c
	    on c.object_id = t.object_id
		and c.column_id = fk.parent_column_id
	join sys.objects o
		on o.object_id = fk.constraint_object_id
	 where t.name = 'some_db_table'
    and c.name = 'some_column_in_table'

if @fc_name is not null
   declare @sql varchar(max) = 'alter table some_db_table ' + ' drop constraint ' + @fc_name 
   exec (@sql)