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State about the Use Case Diagram
A use case diagram represents a set of use cases, actors and their relationships. These diagrams shall be used to model context or requirement of a system. It consists of use cases, actors, generalization, dependency, relationship, association, constraints, roles, packages and instances. The use case diagram makes systems, subsystems, and classes accessible by presenting an outside view of how elements may be used in context. The notation for use cases and relationship between use cases, base cases and extend cases is shown as:
Figure: Relationship among use cases
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice employs
Should I select imaging software that allows changes? An imaging system should not give features to edit or alter images. Images generally are formed as safe and secure records
Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT. DROP TABLE command - This command drops the specified table. Dropping a table also dro
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
i want to database for online assignment submission system
(a) Why did SAP introduce the extended star schema?
The Update Operations : Update operations are used for altering database values. The constraint violations faced by this operation are logically the similar as the problem faced
explain normalisation
Question 1 Indexes are ocasionally defines on a single field of a file called an indexing field. List and describe the different types of indexes Question 2 Consider a book i
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