![[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/databases3b-1194350513421983-3/75/databases3b-8-2048.jpg?cb=1672467005)
![husband wife mother child ward patient employee company car person main residence publisher book author book film actor film director student A-level course customer product stock item supplier ,[object Object],[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/databases3b-1194350513421983-3/75/databases3b-13-2048.jpg?cb=1672467005)
![Hospital ERD exercise A hospital is organised into wards. Each ward has a ward number and a name recorded, along with the number of beds in that ward. Each ward is staffed by nurses. They have their staff number and name recorded and are assigned to a single ward. Each patient in the hospital has a patient identification number and their name, address and date of birth are recorded. Each patient is under the care of a single consultant and is assigned to a single ward. Each consultant is responsible for a number of patients. Consultants have their staff number, name and specialism recorded. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Extension: Consider students, teachers and courses in the same way](https://image.slidesharecdn.com/databases3b-1194350513421983-3/75/databases3b-14-2048.jpg?cb=1672467005)
![Police Database exercise A system for tracking the officers on different cases is needed within a police unit. Each officer belongs to a single department. Officers are allocated to cases. Each officer can be allocated to more than one case at any given time and each case could be worked on by a number of officers. Each case has a single supervising officer (or ‘supervisor’) in charge of it who may supervise more than one case at a time. The following information needs to be stored: case ID number; type of case; description of the case; the date a case is opened (and closed); the result of the case; officers’ name, rank, department and gender; supervisors’ name and rank Extension : where would the date an officer was assigned to a case go? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Extension: Consider a library in the same way.](https://image.slidesharecdn.com/databases3b-1194350513421983-3/75/databases3b-16-2048.jpg?cb=1672467005)
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databases3b
- 1. Review of database basics
- 2. Fields Attributes ‘ atomic’ Data types Primary key Validation rules Input masks L: letter A-Z (required) ?: letter A-Z (optional) 0: number 0-9 (required) 9: number (optional) range (or limit) check, e.g. between 10 and 20, >10 list check, e.g. ‘a’ OR ‘b’ OR ‘c’ (better as a dropdown list) Design a database to store personal information of 6 th Form students
- 3. tables queries (select some data only) macros forms (on screen) reports (on paper) what the user can see add a new student see all students see all in Year 13 list of all students list of all in Year 13 ? Design a database to store personal information of 6 th Form students
- 4. Primary key? Starter £4.00 3 13 1125 £2.00 2 12 1125 £4.00 1 13 1124 £3.00 1 14 1123 £2.00 2 12 1123 £4.00 3 13 1122 £2.00 2 12 1122 price quantitySold stockNum orderNum
- 6. Project number Project name Employee number Employee name Rate category Hourly rate 1. consider single table Consider the Employees and Projects table on the webpage 2. assign primary key(s)? Project number Project name Employee number Employee name Rate category Hourly rate 5. spot another (less obvious) Employee number Employee name Rate category Hourly rate Project number Employee number 6. …and remove it Employee number Employee name Rate category Project number Employee number Project number Project name Rate category Hourly rate 3. spot repeated groups of data… Project number Project name Employee number Employee name Rate category Hourly rate 4. …and remove them Employee number Employee name Rate category Hourly rate Project number Employee number Project number Project name
- 9. form student ONE form(s) contains ONE student(s) MANY MANY event world record ONE event(s) has ONE world record(s) MANY MANY employee project ONE employee(s) can work on ONE project(s) MANY MANY ( ) ( ) ( ) ( ) ( ) ( )
- 10. event world record ONE event(s) has ONE world record(s) MANY MANY ( ) ( ) event world record might as well merge into the one table (nothing to be gained from having two) a ONE-to-ONE relationship
- 11. form student ONE form(s) contains ONE student(s) MANY MANY ( ) ( ) This is what you are after It makes your database more efficient a ONE-to-MANY relationship form student
- 12. employee project ONE employee(s) can work on ONE project(s) MANY MANY ( ) ( ) Impossible to do in your database! Needs to be resolved… a MANY-to-MANY relationship employee project employee project employee_project Use a ‘link’ table between them
- 15. nurse patient ward consultant staffID Title Forename Surname staffID Title Forename Surname wardID (FK) patientID Title Forename Surname AdmissionDate staffID (FK) wardID (FK) wardID wardName Building Floor Tel
- 17. supervisor Cases Officers Department Officers Cases Clue for previous situation