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Explain outer join?
Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such rows could be forcefully selected through using the outer join. The corresponding columns for in which row will have NULLs. There are actually three forms of the outer-join operation: left outer join ( X), right outer join (X ) and full outer join ( X ).
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
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What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
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What are the uses of functional dependencies? To test relations to see whether they are legal under a given set of functional dependencies. To state constraints on the set
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
List some instances of collection types? a) sets b) arrays c) multisets
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