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What are the advantages of having an index structure?
Ans: The index structures commonly provide secondary access paths, which offer alternative ways of accessing the records without influencing the physical placement of records on disk. They allow efficient access to records based upon the indexing fields that are employed to construct the index. Indexes are used to enhance the efficiency of retrieval of records from a data file.
object oriented database
Explain the ISA relationship Answer: ISA relationship - ISA notation is employed in generalization/ specialization to depict relationship among lower and higer level entity s
What is inheritance? Define it in detail? Inheritance Inheritance can be at the levels of types, or at the level of tables we first consider inheritance of types, then i
Differentiate between Primary and secondary storage? Primary and secondary storage - Primary storage device stores the data temporarily. Primary storage is commonly used thro
What do you mean by Correlated subquery? Subqueries, or nested queries, are used to bring back a set of rows to be used by the parent query. Depending on how the subquery is writ
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
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 re
What is Information System?
what should be included in this???
After the completion of the logical model the physical model is to be made. The oracle 10 G will be used as a database server and all the tables with their column are created and i
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