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What are the properties in a relation ?
In a relation Ordering of rows is immaterial and No two rows are identical.
What is a recovery scheme? An integral part of a database system is a recovery scheme that can restore the database to the reliable state that existed before the failure.
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
Define an abstraction by which relationships are treated as higher level entities Ans: Aggregation. It is an abstraction by which relationships are treated as higher level
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
a publishing company produce scientific books on various subjects. the books are written by authors who specialize in one particular subject. the company employs editors who, not n
Explain the Strategy of Database Planning ?
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
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
folding method and mid square method using visual basic
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