Database schema below shows the relations involved in Maju Holdings system. PARTICIPANTS EVENTS ATTENDANCE STAFFS LOCATIONS TASKS (PARTID, PARTNAME, PARTPHONE, PARTEMAIL, PARTADDRESS, PARTJOB) (EVENTID, EVENTNAME, EVENTBUDGET, EVENTHEME) (ATTID, ATTDATE, EVENTID, PARTID) (STAFFID, STAFFNAME, STAFFADDRESS, STAFFPHONE, STAFFEMAIL, STAFFPOSITION, STAFFSALARY) (LOCID, LOCNAME, LOCSIZEAREA, LOCADDRESS) (STAFFID, EVENTID, LOCID, LEADERID, TASKDESCRIPTION, TASKDATE) Each year, Maju Holdings will organize few events for public to attend and gain new knowledge. Each event is led by a staff. There are a lot of other staffs who will be given different tasks to handle the event. The event can be held at many different locations depending on the availability of the location. The attendance for the participants is recorded for future use by the company. The default date format is DD-Mon-YYYY. 2. Retrieve these data with SQL and Relational Algebra. a) List the name of the leaders and event name that they have managed. (3 marks)