Exercise 3.19 Briefly answer the following questions based on this schema: Emp(eid: integer, ename: string, age: integer, salary: real) Works(eid: integer, did: integer, pct_time: integer) Dept(did: integer, budget: real, managerid: integer) 1. Suppose you have a view SeniorEmp defined as follows: CREATE VIEW SeniorEmp (sname, sage, salary) AS SELECT E.ename, E.age, E.salary Emp E WHERE E.age > 50 FROM Explain what the system will do to process the following query: SELECT S.sname SeniorEmp S WHERE S.salary > 100,000 FROM 2. Give an example of a view on Emp that could be automatically updated by up- dating Emp. 3. Give an example of a view on Emp that would be impossible to update (auto- matically) and explain why your example presents the update problem that it does.

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