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what is Lossless-join decomposition
What is Relational calculus? Relational calculus is a Non- Procedural language.
Consider the following relations: S (S#, SNAME, STATUS, CITY) SP (S#, P#, QTY) P (P#, PNAME, COLOR, WEIGHT, CITY) Give an expression within SQL for each of queries b
What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w
WHAT IS DSS? WRITE ITS REQUIREMENTS.
What are the two statements regarding transaction? The two statements regarding transaction of the form are:- A) Begin transaction B) End transaction
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
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
explain in detail about crash recovery
Define average seek time. The average seek time is the average of the seek times, calculated over a sequence of random requests.
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