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Dependency Preservation It is obvious that the decomposition must be lossless so that we do not lose any information from the relation that is decomposed. Dependency preservati
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
Assume you are given a uniprocessor system with one gigabyte of memory and a 300 gigabyte disk. The OS on the machine has a demand paged virtual memory system with a local page rep
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
Database Administrator One of the main perpose for having the database management system is to have control of both data or programs accessing that data. The person having li
Australian Bureau of Statistics (ABS) provides retail data for different groups and different states as well as the aggregate numbers. Table 11 " Retail Turnover, State by Industry
What is object containment? References among objects can be used to model dissimilar real-world concepts.
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