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What is assertion? Mention the forms available.
An assertion is a predicate expressing a condition that we wish the database always to satisfy.
Domain integrity constraints.
Referential integrity constraints
explaination
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
sir, could anybody help me in getting complete information about the mentioned topic
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
What is a B+-Tree index? A B+-Tree index takes the form of a balanced tree in which each path from the root of the root of the root of the tree to a leaf of the tree is of the
What is known as heap file organization? In the heap file organization, any record can be placed anywhere in the file where there is space for the record. There is no ordering
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
Unrepeatable reads : Assume T7 reads X twice during its implementation. If it did not update X itself it could be very disturbing to see a dissimilar value of X in its next read. B
explain normalisation
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