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Explain trivial dependency?
Functional dependency of the form α ->β. is trivial if α C β. Trivial functional dependencies are satisfied by all the relations.
A student entity type has the following attributes,name..
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
NEED ER DIAGRAM WITH MINIMUM ENTITY AND RELATIONSHIP of Hospital Management System
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
Explain nested relations? Nested relations The assumption of INF is a natural one in the bank examples we have considered. However, not all applications are best modelled
Explain the two constraints, check and foreign key in SQL along with an example for each. Give the syntax. CHECK constraint - CHECK constraint specifies an expression which
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.
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Illustrate the class diagram for class room scheduling system If in any college, the number of classrooms are limited which have to be allocated to various classes and instruct
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