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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
What is the major advantage of object-oriented programming paradigm? The ability to modify the explanation of an object without affecting the rest of the system is the main adv
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
Define outer union operation of the relational algebra. Compute the outer union for the relations R and S given below. Outer Join - If there are any values in one tabl
Design a gennalization and specialization hierarchy for an automobile sales company
Describe the shadow paging technique.
Scenario 1: Power goes out after the first instruction. What happens?
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
differences between a classified catalog and a dictionary catalog
(a) Data warehouse can be defined as "a subject-oriented, integrated, time-variant, non-volatile collection of data" in support of management's decision making process. Explain ea
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
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