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Explain what is Aggregation ?
Aggregation: This is used whenever we intend to show a relationship between an entity and the relationship. There is no provision for this in the ER Model. This is shown by placing the relationship between two entities along with the entities in a box and setting up a relationship between this box and another entity.
Explain group By clause in SQL? Group By clause in SQL: The GROUP BY clause can be used in a SELECT statement to collect data across multiple records and group the results thro
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
Draw an Entity-Relationship model for the relational schema given in the Appendix. Show all the entities, relationships, relationship names, and attributes and also underline the
Where does view definition stored? A view definition is permanently stored as part of the database.
Describe Dynamic Model. The dynamic model specifies allowable sequences of changes to the objects from an object model. It contains event trace diagrams describing scenarios. A
Explain TPS concurreny executions stating their advantages in online business advancement
how to calculate frequency count of algorithm
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform.
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