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Explain Derived and Non-Derived Attribute?
In few cases, two or more attribute values are related, for instance, Age and BirthDate attributes of a person. For specific person entity, the value of Age can be determined from the current date and the value of that person's BirthDate. Therefore, the attribute Age is known as derived attribute and the attribute BirthDate is known as non-derived or stored attribute.
what is union compatable?
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
a) Distinguish between ‘database' and ‘Database Management Systems (DBMS)'. b) List and briefly describe five potential benefits of the database approach compared to conventio
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
Which is another name for weak entity? Child is another name of weak entity.
sql is relationally complete-justify
Have a look around the site, and at some of the sites they have featured. These are all examples of bad design, and also offer an explanation about why they fall into this category
What is Oracle databse structure? Oracle database structure: The relational model has three main aspects: Structures: Structures are well-defined objects which store th
Define single valued and multivalued attributes. Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes. M
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
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