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What is substitutability?
Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, as the messages, methods, and functions do not have to be written again for objects of class B.
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
What is Cardinality Ratio? Cardinality Ratios - The cardinality ratios for relationship kinds specifies the maximum number of relationship instances in which an entity can pa
State the definition of association An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, asso
An Enterprising group of Entrepreneurs introduced a new business named StoreItRite which is based on data storage and retrieval services. It provides the services and the company c
What are the several forms of identity? a) Value b) Name c) Built-in
Describe the functions and features of foreign key? Foreign Key : The primary key of one file or table that is implanted in another file or table to implement the relationships
What is the role of a database administrator?
write-set(T): Each data items that are written by a transaction T
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
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