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What are the categories of SQL command? SQL commands are separated in to the following categories: 1. Data - Definitition Language 2. Data Manipulation language 3. Dat
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
define normalisation and functional dependency
What is Explicit update In explicit update, each derived attribute is defined with respect to one, or more fundamental base object(s). The object designer determines that de
Normal 0 false false false EN-US X-NONE X-NONE
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
Design a generalization–specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attrib
What is Cross Product? Simply Cross product is Binary Operator
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
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