# NCERT Solutions Class 12 Computer Science Database Concepts

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NCERT Solutions Class 12 Computer Science  Database Concepts. NCERT book for Computer Science in class 12 is strongly recommened by teachers and the CBSE and NCERT boards. Please download the NCERT solutions for class 12 Computer Science free in PDF made by teachers of the best schools in India. These solutions are carefully compiled to give detailed understanding of the concepts and also steps of solutions. The NCERT solutions are free to download in pdf format. Please refer to the download link below to download the pdf file and also refer to other chapters and subjects to get the solutions to Computer Science NCERT book questions and exercises.

Chapter - Database Concepts

Question 1: What is relation? Define the relational data model.

Answer: A relation is a table having atomic values, unique row and unordered rows and columns. The relational mode represent data and relationship among data by a collection of tables known as relation, each of which has a number of columns with unique names.

Question 2: What are all the domain names possible in gender ?

Answer: Male and Female.

Question 3: Give a suitable example of a table with sample data and illustrate Primary and Candidate Keys in it.

Answer: A table may have more than one such attribute/ group of attribute that identifies a row/tuple uniquely, all such attribute(s) are known as Candidate Keys. Out of the Candidate keys, one is selected as Primary Key,

Question 4: Differentiate between cardinality and degree of a table with the help of an example.

Answer: Cardinality is defined as the number of rows in table. Degree is the number of columns in a table, eg: Consider the following tables

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