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Define Join and Outer Join and differentiate between them.
Ans: Join - It generates all the combinations of tuples from two relations which satisfy a join condition. Outer Join - If there are any type of values in one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected. Such rows can be forcefully selected through using the outer join. The corresponding columns for that row will comprise NULLs. There are in fact three forms of the outer-join operation: left outer join, right outer join and full outer join.
What are the advantages of having an index structure? Ans: The index structures commonly provide secondary access paths, which offer alternative ways of accessing the reco
Define Deadlock recovery measures To recover from deadlock, the cycle in the wait-for-graph should be broken. The common technique of doing this is to rollbac
BCNF Boyce-Codd Normal Form A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relati
Prove that a relation which is 4NF must be BCNF. Ans Let R be in 4NF. Suppose it is not in BCNF. Hence, there exists an FD X→Y in R such that x is not a super key. Although
We require an advanced system for a Sports Centre, you are concerned only with representing the data discussed below about bookings and members. (The complete system may contain ot
Copy Data from One Database to another Database Project Description: I am having two MySQL databases with same tables. I just need to copy one Data from one to another dat
A relation has: Relational Schema Relation instance Relational Schema: A relational schema shows the relation's name, its attributes and the domain of every a
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
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Consider the following six relation schemes and their corresponding sets of functional dependencies. In each case identify a. All the candidate keys b. The highest normal for
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