I would like to know if it is correct that there is a table in the database that contains only one record. And that this record in turn is a primary key. I have analyzed the logic of my relationships and can not think of anything else other than to use the table in this way.
The answer is whether it is correct that this table has a field defined as primary key, is that if it is correct if you need to have relations with other tables, also define as primary key helps us that our table has a unique index, as benefits consitencia and performance.
That has a single field defined as a primary key, with only one record, is correct if your design requires it, I wonder what would a table with a field defined as a primary key and only have a record.