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Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
What is NULL? Simply NULL means not in value.
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
What is a Phantom Deadlock? In distributed deadlock detection, the delay in propagating local information might cause the deadlock detection algorithms to recognize deadlocks
What is Functional Dependency? A Functional dependency is shown by X Y among two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple
How to reduce data redundency
What are the object-oriented approaches Software systems which are designed with structured design methodology never support some of desired quality attributes for example reus
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