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Explain Domain calculus
Domain calculus is one of the types of the relational calculus. The formal specification of the domain calculus was planned after the development of the QBE system. Domain calculus has the variables range in excess of single value from domains of attributes. To create a relation degree n for a query result, we should have n domain variables - one for each attribute. An expression of the domain calculus is of the form {X | F(X)}
In which F is a formula on X and X denotes a set of domain variables. The expression characterizes X like F(X) is true.
describe objectivde of file organisation
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
You want to implement following relationships when designing tables. How would you do it? a.) One-to-one b.) One-to-many c.) Many-to-many a.) One-to-One relationship -
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job scheduling for different cubes
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
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