Relational Database Management System (RDMS)
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Questions and Answers

What does RDMS stand for?

  • Row Data Management System
  • Relational Data Management System (correct)
  • Reliable Database Management System
  • Real-time Database Management System

    • How are data stored in RDMS?

  • As arrays and objects
  • As files and folders
  • As rows and columns (correct)
  • As trees and graphs

    • What is the primary key used for in RDMS?

  • Manage multiple users' access
  • Create virtual tables
  • Retrieve the information
  • Exclusively find out the rows (correct)

    • How is RDMS different from DBMS?

    <p>RDMS speaks about relations between entities, while DBMS does not</p> Signup and view all the answers

    What is the primary purpose of a table in a relational database?

    <p>To store a collection of related data entries</p> Signup and view all the answers

    What is a field in the context of a table in a relational database?

    <p>A column in a table designed to maintain specific information about every record</p> Signup and view all the answers

    In the context of a relational database, what is a record or a row?

    <p>Each individual entry that exists in a table</p> Signup and view all the answers

    What is the role of a column in the context of a table in a relational database?

    <p>To contain all information associated with a specific field in a table</p> Signup and view all the answers

    What does a NULL value represent in the context of a table in a relational database?

    <p>A value in a field that appears to be blank</p> Signup and view all the answers

    What is the purpose of an RDBMS (Relational Database Management System)?

    <p>To manage databases based on the relational model introduced by E.F.Codd</p> Signup and view all the answers

    What does the UNIQUE constraint ensure in SQL?

    <p>All values in a column are different</p> Signup and view all the answers

    Which type of constraint ensures that a column cannot have a NULL value in SQL?

    <p>DEFAULT Constraint</p> Signup and view all the answers

    What is the primary purpose of a PRIMARY Key in SQL?

    <p>Uniquely identifies each row/record in a database table</p> Signup and view all the answers

    In SQL, what does the FOREIGN Key do?

    <p>Uniquely identifies a row/record in any another database table</p> Signup and view all the answers

    What is the primary purpose of a primary key in a table within a relational database?

    <p>To enforce the uniqueness of each row</p> Signup and view all the answers

    Which type of integrity ensures that rows cannot be deleted if they are used by other records?

    <p>Referential Integrity</p> Signup and view all the answers

    What is the common data type for a primary key column in MySQL?

    <p>INTEGER</p> Signup and view all the answers

    Which constraint can be used to ensure the uniqueness of values in a column or group of columns in a table?

    <p>UNIQUE constraint</p> Signup and view all the answers

    What is the purpose of the AUTO_INCREMENT attribute for a primary key column?

    <p>It generates sequential integers for the column</p> Signup and view all the answers

    Which constraint ensures that a column cannot contain NULL values?

    <p>NOT NULL constraint</p> Signup and view all the answers

    Study Notes

    Relational Database Management System (RDBMS)

    • RDMS stands for Relational Database Management System
    • In RDMS, data is stored in tables with rows and columns, where each row represents a single record and each column represents a field or attribute of that record

    Primary Key

    • A primary key is a column or set of columns in a table that uniquely identifies each record
    • The primary key is used to ensure that each record in a table is unique
    • The primary purpose of a primary key is to identify each record in a table

    Constraints

    • The UNIQUE constraint ensures that all values in a column or set of columns are unique
    • The NOT NULL constraint ensures that a column cannot have a NULL value
    • The PRIMARY KEY constraint ensures that a column or set of columns uniquely identifies each record and cannot be NULL

    Foreign Key

    • A foreign key is a column or set of columns in a table that refers to the primary key of another table
    • The foreign key establishes a relationship between two tables

    Data Integrity

    • Entity integrity ensures that each record in a table is unique
    • Referential integrity ensures that rows cannot be deleted if they are used by other records

    Data Types

    • The common data type for a primary key column in MySQL is INT (integer)

    Auto-Increment

    • The AUTO_INCREMENT attribute is used to automatically generate a unique integer for a primary key column when a new record is inserted

    Constraints in SQL

    • The PRIMARY KEY constraint ensures that a column or set of columns uniquely identifies each record and cannot be NULL
    • The UNIQUE constraint ensures that all values in a column or set of columns are unique
    • The NOT NULL constraint ensures that a column cannot have a NULL value

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    Learn about RDMS (Relational Database Management System) and its basic features. Understand how information is stored in tables and how multiple users can access it simultaneously.

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