* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Data Modeling Case Study
Survey
Document related concepts
Operational transformation wikipedia , lookup
Expense and cost recovery system (ECRS) wikipedia , lookup
Data center wikipedia , lookup
Microsoft Access wikipedia , lookup
Data analysis wikipedia , lookup
Concurrency control wikipedia , lookup
Entity–attribute–value model wikipedia , lookup
Information privacy law wikipedia , lookup
Microsoft SQL Server wikipedia , lookup
Business intelligence wikipedia , lookup
Open data in the United Kingdom wikipedia , lookup
Data vault modeling wikipedia , lookup
Versant Object Database wikipedia , lookup
Clusterpoint wikipedia , lookup
Transcript
Database Introduction Class Enrollment program Payroll System Database DBMS DBMS Database E-commerce Website • RDBMS: Relational Data Base Management System • SQL: Structured Query Language • DBA: Data Base Administrator • DB Designer/Data Modeler Query or Reporting Tools -1- Multiple (Dual) Perspectives We use this data ACME Enterprise DATA (Information) We do these things CRUD SQL Operations Activity(Operation) HIRE EMPLOYEE Insert Update Delete Select PAY EMPLOYEE Create Read Update Delete User Interface App. ...... ...... .... .... EMPLOYEE (Resource) PROMOTE EMPLOYEE FIRE EMPLOYEE Data Process -2- Database Tables -3- 3 SQL Select and Query Design in Access SELECT COURSE.C_ID, COURSE.TITLE, COURSE.FEE FROM COURSE WHERE (((COURSE.FEE)>250 And (COURSE.FEE)<=350)) ORDER BY COURSE.FEE DESC; -4- Relationships among Access Database Objects Basic Database Objects Database Application Form Report Tables Query (View) • QUERY in Access can be SELECT, INSERT, UPDATE, or DELETE. • • • A saved SELECT query is officially called a View in SQL standard. When you save a query, you save the definition of the query, not the query result. You can create a query against a table or a query. You can create a form or report against a table or a query. -5- Database: Tables, Columns, Rows, Primary Keys, Foreign Keys and Relationships Potential relational database for Coca-Cola Bottling Co. -6- Data Model (Entity Relationship Diagram) Member Order sells; is sold on Product placed by; places Member is enrolled under; applies to established by; established generates; generated by is featured in; features Agreement Promotion sponsors; is sponsored by Club -7- Data Modeling Case Study The following is description by a pharmacy owner: "Jack Smith catches a cold and what he suspects is a flu virus. He makes an appointment with his family doctor who confirm his diagnosis. The doctor prescribes an antibiotic and nasal decongestant tablets. Jack leaves the doctor's office and drives to his local drug store. The pharmacist packages the medication and types the labels for pill bottles. The label includes information about customer, the doctor who prescribe the drug, the drug (e.g., Penicillin), when to take it, and how often, the content of the pill (250 mg), the number of refills, expiration date, and the date of purchase." Please develop a data model for the entities and relationships within the context of pharmacy. Also develop a definition for "prescription". List all your underlying assumptions used in your data models. -8- 8 Northwind Database -9- 9 A Business Form 10 - 10 - An Informal Example of Normalization • A CUSTOMER ORDER contains the following information: – – – – – – – – OrderNo OrderDate CustNo CustAddress CustType Tax Total one or more than one Order-Item which has • • • • • ProductNo Description Quantity UnitPrice Subtotal. 11 - 11 - Solution Unnormalized table (OrderNo, OrderDate, CustNo, CustAddress, CustType, Tax, Total, 1{ProductNo, Description, Quantity, UnitPrice,Subtotal}n) Remove repeating group 1st NF (OrderNo, ProductNo, Description, Quantity, UnitPrice, Subtotal) Remove partial FD 2nd NF (OrderNo, OrderDate, CustNo, CustAddress, CustType, Tax, Total) Remove transitive FD (OrderNo, ProductNo, Quantity, UnitPrice, Subtotal) (ProductNo, Description, UnitPrice) 3rd NF (OrderNo, OrderDate, CustNo, Tax, Total) (CustNo, CustAddress, CustType) 12 - 12 - JOIN and Aggregation Function Show students ID, name, and GPA SELECT STUDENT.S_NO, STUDENT.NAME, Round(Avg(REGISTRATION.GRADE)*100)/100 AS AvgOfGRADE FROM STUDENT INNER JOIN REGISTRATION ON STUDENT.S_NO = REGISTRATION.S_NO GROUP BY STUDENT.S_NO, STUDENT.NAME; Or Format(Avg(REGISTRATION.GRADE), "###.00") AS AvgOfGRADE - 13 - Database(Access) vs. Spreadsheet (Excel) Features Database Excel Multi-user concurrent access/update to the data Volume of the data Complex relationships of various data Calculation /formula among various data items Business graph capability Applications development tools - 14 - http://www.oracle.com/tools/jdeveloper/documents/jsptwp/index.html?content.html Auction Web Site's Data Model - 15 -