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Cardinality of Relationship
One-to-One
Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher is teaching only one learner.
One-to-Many
Only one entity of the first set is related to many entities of the second set. E.g. A teacher teaches learners.
Many-to-One
Multiple entities of the first set are related to many entities of the second set. E.g. Teachers teach a learner.
Many-to-Many
Multiple entities of the first set are related to multiple entities of the second set. E.g. Teachers teach learners
Why, generally does an object-oriented system use the relational DBMS? The reasons for using relational DBMS for OO systems could be any combination of following: a. Many or
Two-way Associations Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation. In
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
What is the full form of DDL? DDL is stand for Data Definition Language.
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
Define instance and schema? Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database. Schema: The o
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
give some example real-life situations where DBMS are most suiitabe
the of super market system done in database
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
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