View updating and relational theory v413hav Saxey chat free punjabi girls
In stark contrast to this conventional wisdom, this book shows how views, just like base tables, can always be updated (so long as the updates don’t violate any integrity constraints).
More generally, it shows how updating always ought to work, regardless of whether the target is a base table or a view.
In this chapter and the next two, I turn my attention to intersection, union, and difference views.
Of course, I’ve already said something in Chapter 6 about intersection views in particular (the subject of the present chapter)—recall that intersection is a special case of one to one join—but there’s quite a lot more to be said on the subject.