Explain the concept of data mining, Database Management System

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Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls?

Question 2 With a necessary example explain (i) Basic Constructs of E-R Modeling (ii) E-R Notations

Question 3 Explain the first 3 Normal Forms taking the help of an un-normalized relation and reducing it to 3 NF

Question 4 Explain the concept of Data Mining? How it is related with data warehouse

Question 5 Write the SQL queries using Data Manipulation Language (DML) statements

Question 6 Create the payroll database considering table employee

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