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Define the term- Actors and Data Stores
Actors: An actor is the active object which drives data flow graph by producing or consuming values. Actors are attached to inputs and outputs of the data flow graph.
Data Stores: A data store is passive object within the data flow diagram which stores data for later access. A data store permits values to be accessed in the different order than they are generated.
What are the advantages of creating a table from existing table?
what do you understand by enhanced entity-relationship
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
what do you mean by consistency in rdbms?
Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is: If R has m tuples and S has n tuples then maximum siz
coventions for displaying an ER schema as ER diagram
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
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