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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.
These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
external view of DBMS in healthcare department?
If one requires to access data using Logical Database , the use of events is unavoidable. Yes, if someone wants to access data using Logical database then the use of events
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
it can be possible to create any table without primary key
2NF Normal Form : A relation schema process R is in 2NF if it is in 1NF and each non-prime attribute A in R is fully functionally related on primary key. Second normal form (2N
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
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