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Now that she understands more about the benefits of databases, the play-scheme manager would like to extend the play-scheme database to include data for schools and instructors as detailed below.
The manager wants to store the name, address and phone number for each school in the play-scheme's catchment area (regardless of whether any children from the school are registered for the play-scheme). She also wants to record which school each child attends. (Each child can only attend one school.)
PRINCIPLES OF DATABASE 1. State the following terms: a) Database b) Database Management System c) Entity d) Attribute e) Relationship 2. Discuss the Three Level Architecture
Q. Why would you choose a database system instead of simply storing data in operating system file? Define at a base concept in details. Sol. Advantages of Database over Fil
What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
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
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Explain Composite attribute in SQL ? Composite attribute: A composite attribute has many components, each of that is atomic or composite.
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
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