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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.
What is property - properties of a database ? It is an integrated collection of logically related records. It consolidates separate files into a common pool of data records and
Research Value: 7% Due Date: 17-Sep-2018 Return Date: 11-Oct-2018 Length: 700 words Submission method options: Alternative submission method Task back to top You are required to
Determine the OBJECTIVES of object design After passing through this unit, you should be able to: describe and apply concept of generalisation; understand and appl
The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c
Example- Search the salary of employees who are not 'ANALYST' but get a salary below than or equal to any people employed as 'ANALYST'. SELECT EMPNO, ENAME, JOB, SAL FROMEMP
#question.explain diversity and magnitude of organic compounds and general properties?
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
Create table employee and enter employee data in SQL? Consider the following relational schemas: EMPLOYEE (EMPLOYEE_NAME, STREET, CITY) WORKS (EMPLOYEE_NAME, COMPANYNAME, SAL
Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
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