Why do persistent programming languages allow transient objects? Might it be simpler to use only persistent objects, with unneeded objects deleted at the end of an execution? Explain your answer.
Answer to relevant QuestionsUsing ODMG C++a. Give schema definitions corresponding to the relational schema shown in Figure, using references to express foreign-key relationships.b. Write programs to compute each of the queries in Exercise 3.10.Consider a system that provides persistent objects. Is such a system necessarily a database system? Explain your answer.Give an SQL: 1999 schema definition of the E-R diagram in Figure below, which containsspecializations.Give the DTD for an XML representation of the following nested-relational schema Emp = (ename, ChildrenSet setof (Children), SkillsSet setof (Skills))Children = (name, Birthday)Birthday = (day, month, year)Skills = (type, ...Write queries in XQuery on the bibliography DTD fragment as shown below to do the following.a. Find all authors who have authored a book and an article in the same year.b. Display books and articles sorted by year.c. Display ...
Post your question