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Concurrency Identification
While designing analysis, model we map real world model into our analytical model. Real life objects are simultaneous in nature, but all the design model objects are not concurrent in nature, as single process may support multiple objects.
Explain the concept of QBE? Query-by-example represents a visual/graphical approach for accessing information in a database by the use of query templates called as skeleton tab
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
Describe the term- State Diagram State Diagram: An object could receive a sequence of the input instructions. The state of the object can differ depending upon sequence of in
What is a guard condition? Explain it with a suitable example. The guard-condition is a Boolean expression written with respect to parameters of triggering event and attributes
what is Storage-Device Hierarchy question
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aggregation
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