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What is recursive closure? Why is it not possible to describe this operation in relational algebra?
Recursive closure is applied to recursive relationship. An instance of recursive operation is to retrieve all SUPERVISEES of an Employee e at all levels- which is , all EMPLOYEE e directly supervised through e; all employees e" directly supervised through each employee e" and so on .
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
Explain the concept of a data model ? Data Model - Model is an abstraction procedure which hides irrelevant details although highlighting details relevant to the application
What is schema
1. Staff (staffID --> availabilityID) 2. Services (servicesID --> itemBasedID --> timedBasedID) 3. TimedBased (timedbasedID--> priceid) 4. Clients (clientId, serviceId-->
a method named WonGame that checks each letter in the word is matched by its label
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Write a query that display ename annual salary and comm from emp table
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
There are three main sources of utilities and applications for a DBMS: a. Vendor applications and utilities are given for working with or maintaining the database, and generally
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