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(a) Explain briefly the three parts of a relational Model.
(b) Contrast the following terms with an appropriate example:
(i) stored attribute v/s derived attribute (ii) entity type v/s entity instance (iii) strong entity type v/s weak entity type (iv) simple attribute v/s composite attribute (v) unary relationship v/s binary relationship.
(c) The term integrity refers to the accuracy or correctness of the data in the database. Define the following terms:
(i) Domain Integrity (ii) Entity Integrity (iii) Referential Integrity.
(d) Constraints are rules that restrict the data values that you can enter into a field in a database table. Briefly describe the following constraint with appropriate example for each:
(i) Check Constraint (ii) Not Null Constraint (iii) Unique Constraint
What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w
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I want a script that will run, and update my virtual machine's LAN settings (proxy server and port), and also re-configure the Firefox User Agent. I want a script that will run,
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Explain four causes for failures in data warehouse projects
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
Discuss along with examples about several types of attributes present in the ER model? Types of Attributes are: • SIMPLE attributes are attributes which are drawn from the ato
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