Question: Please help with Database Relational Algebra and Nested Queries. A nested query is a query within a query. More specifically, a nested query is a

Please help with Database Relational Algebra and Nested Queries.

Please help with Database Relational Algebra and Nested Queries. A nested query

is a query within a query. More specifically, a nested query is

A nested query is a query within a query. More specifically, a nested query is a parenthesized query whose result can be used as a value in a number of places, such as instead of a relation. Specify the following queries on the database specified in Figure 5.5 using the concept of nested queries and the relational operators discussed in this chapter. Also show the result of each query as it would apply to the database state in Figure 5.6

a) List the names of all employees who work in the department that has the employee with the highest salary among all employees.

b) List the names of all employees whose supervisors supervisor has 888665555 for Ssn.

c) List the names of employees who make at least $10,000 more than the employee who is paid the least in the company.

EMPLOYEE Fname Minit Lname Ssn Bdate Address Sex Salary Super_ssn Dno DEPARTMENT Dname Dnumber Mgr_ssn Mgr_start_date DEPT LOCATIONS Dnumber Dlocation PROJECT PnamePn umber PlocationDn um WORKS ON Essn Pno Hours Figure 5.5 Schema diagram for the COMPANY relational database schema. DEPENDENT Essn Dependent nameSex Bdate Relationship

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