Database Design and Normal Forms Database Design coming up with a ‘good’ schema is very important How do we characterize the “goodness” of a schema ? If two or more…
Sudipta Saha Page 1 5/6/2011 Database Normalization Theory (Upto BCNF) The goal of a relational-database design is to generate a set of relation schemas that allows us to…
Slide 1 Active DatabasesCIS 6711 Triggers: The Problem - Examples from COMPANY Database 1.Limit all salary increases to 50%. 2.Enforce policy that salaries may never decrease.…
Slide 1 LECTURE 3 THE RELATIONAL DATABASE MODEL Slide 2 Origins of the Relational Data Model It was developed by E.F. Codd in the early 1970s Commercial systems based on…
Triggers: The Problem - Examples from COMPANY Database Limit all salary increases to 50%. Enforce policy that salaries may never decrease. Maintain TotalSalary in DEPARTMENT…