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What is recursive closure? Why is it not possible to describe this operation in relational algebra?
Recursive closure is applied to recursive relationship. An instance of recursive operation is to retrieve all SUPERVISEES of an Employee e at all levels- which is , all EMPLOYEE e directly supervised through e; all employees e" directly supervised through each employee e" and so on .
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 meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
Multilevel Indexing Scheme Consider the indexing scheme where the address of the block is consider in the index for each record, for a little file, this index would be little a
i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
How many physical thing?
explain equi-join using illustration
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
to develop elrctronic database from manual forms
What is recovery management component? Ensuring durability is the responsibility of a software component of the base system known as the recovery management component.
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