Explain how dangling tuplesmay arise. Explain problems that theymay cause.
Answer to relevant QuestionsFor each of the following application areas, explain why a relational database system would be inadequate. List all specific system components that would need to be modified.a. Computer-aided designb. Multimedia databasesExplain the distinction in meaning between edges in a DAG representing inheritance and a DAG representing object containment.Consider a system that provides persistent objects. Is such a system necessarily a database system? Explain your answer.Consider the relational schema shown in Figure below.a. Give a schema definition in SQL: 1999 corresponding to the relational schema, but using references to express foreign-key relationships.b. Write each of the queries in ...Write queries in XSLT and in XPath on the DTD of Exercise 10.3 to list all skill types in Emp.Emp = (ename, ChildrenSet setof (Children), SkillsSet setof (Skills))Children = (name, Birthday)Birthday = (day, month, ...
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