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Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
What is called as recursive partitioning? The system repeats the splitting of the input unless each partition of the build input fits in the memory. Such partitioning is known
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
Candidate Key: In a relation R, a candidate key for R is a subset of the set of attributes of R, which have the differnt two properties: (1) Uniqueness: N
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
wh
differences between a classified catalog and a dictionary catalog
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