Preparing for BIT – IT2301 Database Management Systems 2001d
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Preparing for BIT – IT2301 Database Management Systems, on Rupavahini by Gihan Wikramanayake, 07th June 2001, 2200-2230 hrs.
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Preparing for BIT – IT2301 Database Management Systems 2001d
- 1. IT2301 Database Management Systems [email_address] PREPARING FOR THE BIT Preparing for BIT 07/06/2001
- 6. user a user i /program j program x sub-schema a sub-schema i sub-schema z conceptual schema physical schema 3 Level Architecture Databases
- 12. user a user i /program j program x sub-schema a sub-schema i sub-schema z conceptual schema physical schema DDL SDDL DML/SQL Practitioners: DBA Users Databases
- 25. Entity occurrences Mr. De Silva, Manager of Personnel Department Mrs Perera, Secretary of Personnel Department Employees
- 29. Relationship Employee Name, Designation, Department Department Name, Manager === works for ==>
- 32. Relationship Rows in one or more tables are associated with each other solely through data values in columns (no pointers). Foreign Key Primary Key Primary Key D-No D-Name M-No 4 Finance 857 7 Sales 179 Primary Key Department Employee E-No E-Name D-No 179 Silva 7 857 Perera 4 342 Dias 7
- 33. Relational DB Server Architecture Conceptual Layer Physical Layer System Catalogue Base Tables External Layer Stored Tables ... View View View
- 34. External Model Name Designation Department De Silva Manager Personnel Dias Programmer Computer Perera Chief Accountant Accounts Silva Clerk Accounts View Table Employee Details View View View
- 36. External Model User Views Personnel Employee … Department Production Product … Supplier Sales Customer … Product View View View View View View View View View
- 38. Conceptual Model Table Table Table E-No Name Designation DOB D-No 01 Dias Programmer 12-05-1956 COM 02 Perera Chief Accountant 15-12-1958 ACC 03 De Silva Manager 01-01-1960 PER 05 Silva Clerk 25-09-1965 ACC Base Table Employee
- 39. Personnel Employee … Department Production Product … Supplier Sales Customer … Product Employee Department Product Customer Table View View View View View View View View View Table Table Table
- 41. Physical Model Index Files Stored Tables