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Database Design: Conceptual Model and ER Diagramming

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Presentation on theme: "Database Design: Conceptual Model and ER Diagramming"— Presentation transcript:

1 Database Design: Conceptual Model and ER Diagramming
Kay Ashaolu University of California, Berkeley School of Information IS 257: Database Management IS 257 – Fall 2015

2 Announcements Accounts and MySQL access
Assignment 1 on web site (more at end of class) IS 257 – Fall 2015

3 Note on drawing diagrams
You will be asked to draw ER (or UML) diagrams for your personal database I prefer diagrams drawn with a drawing tool or DB Design tool There are loads of DB Design tools See, e.g., One that integrates well with MySQL is MySQLWorkBench IS 257 – Fall 2015

4 Lecture Outline Developing the Conceptual Model for the Diveshop Database IS 257 – Fall 2015

5 Developing a Conceptual Model
Overall view of the database that integrates all the needed information discovered during the requirements analysis. Elements of the Conceptual Model are represented by diagrams, Entity-Relationship or ER Diagrams, that show the meanings and relationships of those elements independent of any particular database systems or implementation details. Can also be represented using other modeling tools (such as UML) IS 257 – Fall 2015

6 Developing a Conceptual Model
Building the Conceptual Model for the Diveshop database IS 257 – Fall 2015

7 Developing a Conceptual Model
We will look at a small business -- a diveshop that offers scuba diving adventure vacations Assume that we have already done interviews with the business and found out the following information about the forms used and types of information kept in files and used for business operations... IS 257 – Fall 2015

8 Primary Business Operations
The shop takes orders from customers for dive vacations. It ships information about the dive vacation to the customers. It rents diving equipment for the divers going on the trips (these may include additional people other than the customer) It bills the customer for the vacation and for equipment rental or sales. IS 257 – Fall 2015

9 Business Operations (cont.)
It arranges sub-trips to particular dive sites at the primary location NOTE: This needs expanding – e.g., charter boats, divemasters, local dive companies It provides information about the features of various sites to help customers choose their destinations. Features include sea life found at the location and shipwrecks IS 257 – Fall 2015

10 Business Operations (cont.)
Each dive order (or sale or trip) is on an invoice to one customer. Invoices contain: Line items for each type of equipment ordered, Total amount due for the invoice, Customer information: Name, address, phone, credit card info. Note: could be expanded with particular charter dates and time, dive boats, etc. Information must be kept on inventory of dive equipment. There are multiple types of dive equipment: The prices charged for sale or rental are maintained IS 257 – Fall 2015

11 Business Operations (cont.)
Destination information includes: Name of the destination information about the location (accommodations, night life, travel cost, average temperatures for different times of the year Destinations have associated dive sites Dive Sites have associated features Difficulty rating, depth, etc. Sea life Shipwrecks (as sites or at sites) Note: could be expanded to include the boats, etc. that go to specific sites IS 257 – Fall 2015

12 Business Operations (cont.)
One record is kept for each order by a customer and will include the method of payment, total price, and location information. (I.e. Customers may have multiple orders) The company needs to know how an order is to be shipped. The shop has to keep track of what equipment is on-hand and when replacements or additional equipment is needed IS 257 – Fall 2015

13 Entities Customer Dive Order Line item Shipping information
Dive Equipment/ Stock/Inventory Dive Locations Dive Sites Sea Life Shipwrecks IS 257 – Fall 2015

14 Diveshop Entities: DIVECUST
Name Customer no Street State/Prov City ZIP/Postal Code Country First Contact Phone DiveCust IS 257 – Fall 2015

15 Diveshop Entities: DIVEORDS
Customer No Order no Sale Date Ship Via Destination CCExpDate CCNumber Payment Method DiveOrds No of People Vacation Cost Return Depart IS 257 – Fall 2015

16 Diveshop Entities: DIVEITEM
Item no Order no Rental/ Sale Qty Line Note DiveItem IS 257 – Fall 2015

17 Diveshop Entities: SHIPVIA
Cost ShipVia IS 257 – Fall 2015

18 Diveshop Entities: DIVESTOK
On Hand Reorder Point Cost Equipment Class Sale Price Description DiveStok Rental Price Item No IS 257 – Fall 2015

19 Diveshop Entities: DEST
Destination name Destination no Avg Temp (F) Spring Temp (C) Summer Travel Cost Winter Fall Dest Accommodations Body of Water Night Life IS 257 – Fall 2015

20 Diveshop Entities: SITES
Destination no Site no Site Name Site Notes Highlight Distance From Town (M) From Town (Km) Skill Level Visibility(ft) Depth (m) Depth (ft) Sites Visibility (m) Current IS 257 – Fall 2015

21 Diveshop Entities: BIOSITE
Species No Site BioSite IS 257 – Fall 2015

22 Diveshop Entities: BIOLIFE
Category Species no Common Name Length (cm) Species (in) Notes external Graphic BioLife IS 257 – Fall 2015

23 Diveshop Entities: SHIPWRCK
Site no Ship Name Category Interest Type Tonnage Length (ft) Beam (m) Shipwrck Cause Comments external Date Sunk Passengers/ Crew Graphic Survivors Condition IS 257 – Fall 2015

24 Functional areas Ordering Inventory Supplies Shipping Billing
Location/Site Selection We will concentrate on Ordering and Location/Site Selection (these are joined tasks) IS 257 – Fall 2015

25 Ordering Orders (DIVORDS) Customer (DIVECUST) Customers place Orders
Each Order needs Customer information IS 257 – Fall 2015

26 Ordering DiveOrds DiveCust ShipVia DiveItem Repeating attribute
Orders DiveCust Customer No ship ShipVia Order No Ship Via DiveItem Repeating attribute IS 257 – Fall 2015

27 Ordering Normalization
DiveCust Orders Customer No DiveOrds Ship ShipVia Order No Ship Via DiveItem Contains Item No Qty Rental/sale IS 257 – Fall 2015

28 Details of DiveItem DiveStok Supplier DiveItem On Hand Sale Price m n
Supplies Supplier Company# Has DiveItem Item No On Hand Sale Price Order No m n We’re ignoring this part... IS 257 – Fall 2015

29 Ordering: Full ER DiveCust ShipVia DiveOrds Dest DiveItem DiveStok
Customer No DiveCust 1 Destination Name Customer No Destination no n ShipVia ShipVia 1 n DiveOrds n Dest 1 1 Destination Order No Order No n DiveItem Item No n 1 DiveStok Item No IS 257 – Fall 2015

30 Location/Site Selection
Destination Destination No Destination Name Going to? DiveOrds Dest IS 257 – Fall 2015

31 Destination/ Sites DiveOrds Dest Sites Destination Name Customer No
1 n DiveOrds Dest Destination no 1 Destination Order No Site No n Sites IS 257 – Fall 2015

32 Sites and Sea Life 1 Sites Destination Site No no Multiple occurrences
BioLife Sites Site No Destination no Multiple occurrences of sea life... IS 257 – Fall 2015

33 Diveshop ER diagram: BioSite
Species No Site BioSite IS 257 – Fall 2015

34 Sites and Sea Life 2 Sites BioSite BioLife Destination Site No no
Species No Site No Destination no 1 n IS 257 – Fall 2015

35 Sites and Shipwrecks Sites ShipWrck Destination Site No no 1 1/n
IS 257 – Fall 2015

36 DiveShop ER Diagram Dest Sites BioSite ShipWrck BioLife DiveStok
Customer No ShipVia Dest Sites BioSite ShipWrck BioLife DiveStok DiveItem DiveOrds DiveCust Order Item Destination Name Species Site No no 1 n n 1 n 1 1 1 n n 1 1 n 1/n n n 1 1 IS 257 – Fall 2015

37 What must be calculated?
Total price for equipment rental? Total price for equipment sale? Total price of an order? Vacation price Equipment (rental or sale) Shipping IS 257 – Fall 2015

38 What is Missing?? Not really an “enterprise-wide” database
No personnel… Sales people Dive masters Boat captains and crew payroll No Local arrangements… Dive Boats Charter bookings? Hotels? Suppliers/Wholesalers for dive equipment Orders for new/replacement equipment No history (only current or last order) IS 257 – Fall 2015

39 Diveshop database We will take a look at the the MySQL version of the DiveShop database using phpMyAdmin IS 257 – Fall 2015

40 MySQL version of Diveshop
MySQL version of the database is available for download through the class web site phpMyAdmin is a web-based interface for MySQL databases providing simple access and modification functions Not really a full DB environment, but has many useful features IS 257 – Fall 2015

41 phpMyAdmin phpMyAdmin has been set up for iSchool MySQL database accounts It can be accessed at Need to have I School login/pw and MySQL login and pw Quick Demo… IS 257 – Fall 2015

42 Assignment 1 IS 257 – Fall 2015

43 Next Week Tuesday: Workshop on SQL Workshop on Personal/Group DBs
IS 257 – Fall 2015

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