Returns the unique identifier for this row. This identifier is
assigned by the different providers, to uniquely identify
rows returned to clients. If there is no ID, this means that
the row has not been created by a provider, or that it the
provider cannot identify it (ie, modifications to it won't
take place into the database).
Returns the unique identifier for this row. This identifier is assigned by the different providers, to uniquely identify rows returned to clients. If there is no ID, this means that the row has not been created by a provider, or that it the provider cannot identify it (ie, modifications to it won't take place into the database).