Database Management System · Unit 4 · 3 hrs
The Relational Data Model and Relational Database Constraints
Exam-focused notes for The Relational Data Model and Relational Database Constraints (Database Management System, CSC265): what the TU syllabus asks and how it has actually been tested, with 5 solved past questions from this unit.
What this unit covers
- Relational Model Concepts
- Relational Model Constraints and Relational Database Schemas
- Update Operations, Transactions, and Dealing with Constraint Violations
Relational Model Concepts
What is relational model? Define the terms domain, attribute, tuple and relation. [5]
The relational model is a data model that represents data in the form of relations (tables). It was proposed by E.F. Codd and is the foundation of relational database management systems (RDBMS). In this model, all data is logically structured as two-dimensi...
Full solved answer →What is relational database? Explain different characteristic of a relation. Defain domain constraint. [5]
--- A relational database is a database that organizes and stores data in the form of tables (relations). Each table consists of rows (tuples) and columns (attributes). It is based on the relational data model proposed by E.F. Codd. Well-known DBMSs like Or...
Full solved answer →Relational Model Constraints and Relational Database Schemas
What is integrity? Explain different types of database integrity. [5]
Database integrity refers to the accuracy, consistency, and correctness of data stored in a database. It ensures that the data in the database remains valid and reliable throughout its lifecycle. Integrity constraints are rules or conditions specified on a ...
Full solved answer →Differentiate between Integrity and Security with example. [5]
Database integrity refers to the correctness, accuracy, and consistency of data stored in the database. It ensures that the data follows certain rules (called integrity constraints) so that the data remains valid and meaningful at all times. : "The integrit...
Full solved answer →Explain the use of primary and foreign key in DBMS with example. What is the role of foreign key? [5]
A primary key is an attribute (or a set of attributes) that uniquely identifies each tuple (row) in a relation (table). It must satisfy two properties: - Uniqueness: No two rows can have the same primary key value. - Not Null: The primary key attribute cann...
Full solved answer →Make Unit 4 stick
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