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Transactional Replication follows the same principle but requires a unique primary key column.
If the schema of the table is part of a source control that was pulled from the database, the columns will be defined in source control.
The last two instances are extremely bad practice, but, as with any bad practice, they do happen.
A resulting problem from these types of modifications is that replication cannot be fully removed.
For example, take a table named Merge Me in database QTuner.
This table consists of a primary key and does not require any additional changes to be used in transactional replication.