Question
Given the following two tables where primary keys are underlined and foreign keys are marked with #: Employee (employeeNo, empName, jobTitle) Project (projectID, projectName, sponsor,
Given the following two tables where primary keys are underlined and foreign keys are marked with #:
Employee (employeeNo, empName, jobTitle)
Project (projectID, projectName, sponsor, startYear, endYear)
WorkedOn (#employeeNo, #projectID, year, month, noHours)
a) Express the following queries in Relational Algebra:
(i) List names and numbers of employees whose job is entitled "System Analyst". [1 mark]
(ii) List all ids of projects that are started in 2015 and sponsored by "Orpic". [1 mark]
b) Write the following SQL query in relational algebra:[1 mark]
SELECT e.empName, p. projectName
FROM Employee e, WorkedOn wo, Project p
WHERE e. employeeNo = wo. employeeNo AND
p. projectID = wo. projectID;
please and thank you
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