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What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
What Count function return in SQL? Count function within SQL returns the number of values. (Count function counts all the not null values in the exact column. If we need to cou
How external/conceptual mapping and conceptual /internal mapping is performed
This constraint shows that the key attribute value in each tuple must be unique, i.e., no two tuples have the similar value for the key attribute. This is because the value of the
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
Benefits of Sequential File Organisation It is quick and efficient when dealing with huge volumes of data that require being processed periodically (batch system). Dra
what benefit can a company gain by managing its own infrasture and services
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
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
Describe in brief about DBMS ?
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