2 The purpose can be a default value so a nullable Test defeats the point. Keith's respond to demonstrates that by initialising it while in the Ctor. If It is really for that dB I do not actually see Substantially difference than using a default column value and allow it https://medium.com/@CommercialPropertyGurgaon/smart-world-sky-arc-defines-urban-elegance-in-sector-69-gurgaon-fc9022cf2707?postPublishedType=initial