A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equipment on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of EQUIPMENT include Serial No and Cost. The organization wishes to record Assign Date—that is, the date when a given equipment item was assigned to a particular chemist working on a specified project. A chemist must be assigned to at least one project and one equipment item. A given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item. Provide good definitions for all of the relationships in this situation.

Please refer to the following diagram for Q19 to Q20. PERSON PK P_ID P_LNAME P_FNAME ΕMPLOYΕ P_ID EMP_HIRE_DATE STUDENT P ID STUDY ΜAIOR PK, FK1 PK, FK1 19. Which of the following statements is/are true? (1) A Person must be either a Student or an Employee. (2) A Person can neither be a Student nor an Employee. (3) A Person must be a Student or an Employee or both. a. (1) only b. (3) only c. (1) and (2) only d. (1), (2) and (3).

Task Description: Consider the following relations for a company: Department (Did: integer, Dname: string, location: string) Employee (Eid: integer, Ename: string, Erank: integer, salary: real, DepartmentID, integer) Project (Pid: integer, DepartmentID: integer, Pname: string, budget: real, start year: integer) The “DepartmentID” fields in both Employee and Project are foreign keys referencing the “Did”field of the Department table.    Use SQL to create a new database (named MyCompany), then use it to build the relations mentioned above. Place the constraints (e.g., default values) you find appropriate.

Customer Equipment Loan id equipmentCode name id name H description RentalRatePerDay address 04 equipment Code e contact startDate dateOfBirth returnDate occupation DamageReport reportId damageType (iii) Create a view named CustomerSummary with details of each customer, the number of equipment rented, the total amount of rental collected thus far and the number of damages caused by customer and not due to wear and tear. ID Name Address Contact DateOfBirth Occupation Number of Equipment Rented Total Rent NumDamage ST82J Charles Toles 23 Haig Road 92142331 15-03-1976 Teacher 20.00 S823F Damien Low 5 Still Road 88128833 05-07-1985 Teacher 1 16.00 1 3 sa56F Audrey Ng 10 Bedok Road 82138213 23-01-1988 Nurse 3 150.00 1 2 Jalan Eunos 8 Jalan Melayu Ali Bin Mohd Hassan 10 Clomonti Road 91239123 4 S345G Betsey Tan 98981212 12-05-1990 Cartoonist 4.00 99234J Peter Lee 97589758 04-03-1991 Student 1 24.00 SATSZ S575J Ravi S/O Ramasamy 12 Jurong Road 6 10-07-1997 IT Programmer 0.00 7 82223333…

Question 8 The ERD below is the initial design to track events and the dates on which they are scheduled. Using the ERD, what can you determine about the statement "There were 5 events on July 4, 2012." EVENT DATE Has Scheduled on O This statement could NOT be true based on the ERD. O This statement could be true based on the ERD.

Indicate dependences and their type.