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What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
Define and differentiate between ordered indexing and hashing. Ans: Ordered indexing: To gain fast random access to records in a file, we can make of an index structure. Every
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
properties of derirable decomposition
Derived horizontal fragmentation: Some applications may include a join of two or more relations. If the relations are stored at dissimilar locations, there may be a major overhead
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
Which data type can store unstructured data? Raw data type can store unstructured data.
Explain the EXISTS and UNIQUE functions of SQL. Give an example for each? EXISTS: The EXISTS function takes one parameter that is a SQL statement. If any records exist which
What is the difference between a key and a superkey? Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one
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