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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
Explain the Fundamental concepts of object-orientation Software developers, data base administrators (DBAs) need to be familiar with fundamental concepts of object-orientation.
Define Forms Based Interfaces? Forms-Based Interfaces - A forms-based interface display a form to each user. Forms are commonly designed and programmed for naive users and inte
entity relationship diagram for online examination system
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
Haw does it work one database application
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