For the Fig. 13.2a model, should the Qualification table contain all the qualifications recognised by the enterprise, or should it contain only those not present in the Qual Of Emp table? Which links...

For the Fig. 13.2a model, should the Qualification table contain all the qualifications recognised by the enterprise, or should it contain only those not present in the Qual Of Emp table?

Which links between table types are implied by posted identifiers, even though there is no direct connection on the E-R type diagram?