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What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
Describe the types of attributes? Types of attributes: An attribute's category determines the type of values that are permitted in the attribute. For instance, the value vers
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
Construct a generalization-specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles that comprise an engine number and cost; cars that have a chass
First Normal Form and second normal form First Normal Form (1NF) A relation is said to be in 1NF if it having no non-atomic values and each row can give a unique combinat
coventions for displaying an ER schema as ER diagram
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
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