Using Figs. 7-6 and 7-7, construct a relation PTA: RELATION father, age, child, age c, schooltype, schoolname; Define the reverse process. Show that there is no information loss when applying both...

Using Figs. 7-6 and 7-7, construct a relation

PTA: RELATION

father, age, child, age c, schooltype, schoolname;

Define the reverse process. Show that there is no information loss when applying both transformations in sequence. Is this realistic?

What additional information is needed in reality?

Take a paper describing a database example and define the files, sets, or relations used in terms of entity relations, lexicons, etc.