Open App

Database Management Exam > Database Management Videos > Mastering R Programming: For Data Science and Analytics > Getting Started With R (R Tutorial 1.3)

Getting Started With R (R Tutorial 1.3) Video Lecture | Mastering R Programming: For Data Science and Analytics - Database Management

Q: 3. How can I retrieve data from a database in R?

Ans. To retrieve data from a database in R, you can use the dbGetQuery() function from the DBI package. This function allows you to execute SQL queries and fetch the result as a data frame. For example, to retrieve all records from a table named 'employees', you would use the following code:```Rlibrary(DBI)result <- dbGetQuery(con, 'SELECT * FROM employees')```The result will be stored in the 'result' variable as a data frame.

Q: 4. How can I insert data into a database in R?

Ans. To insert data into a database in R, you can use the dbExecute() function from the DBI package. This function allows you to execute SQL statements for data manipulation, such as INSERT, UPDATE, or DELETE. For example, to insert a new record into a table named 'employees', you would use the following code:```Rlibrary(DBI)dbExecute(con, 'INSERT INTO employees (name, age, salary) VALUES ('John', 30, 5000)')```This code will insert a new record with the name 'John', age 30, and salary 5000 into the 'employees' table.

Q: 5. How can I close a database connection in R?

Ans. To close a database connection in R, you can use the dbDisconnect() function from the DBI package. This function allows you to terminate the connection and release any associated resources. For example, to close the previously established connection named 'con', you would use the following code:```Rlibrary(DBI)dbDisconnect(con)```This code will close the connection and free any memory or system resources used by the connection.

	Mastering R Programming: For Data Science and Analytics 51 videos

Mastering R Programming: For Data Science and Analytics

51 videos

Join Course for Free

Video Timeline

00:20	How to assign values to an object in R
01:46	How to see what is stored in R?
01:57	How to remove an object in R?
02:52	How to assign values to objects in R
03:37	How to do basic arithmetic in R
04:50	How to take the square root of an object in R
05:07	How to use the "log" function in R
05:12	How to take the exponent or anti-log in R?
05:30	How to calculate the absolute value in R?
06:14	Few h&y keyboard shortcuts
06:41	Including comments & notes
More

FAQs on Getting Started With R (R Tutorial 1.3) Video Lecture - Mastering R Programming: For Data Science and Analytics - Database Management

1. What is database management in R?

Ans. Database management in R refers to the process of interacting with databases using R programming language. It involves tasks such as connecting to databases, querying data, inserting or updating records, and managing database connections.

2. How can I connect to a database in R?

Ans. In R, you can connect to a database using the dbConnect() function from the DBI package. You need to provide the necessary details such as the database driver, server name, username, and password to establish a connection. For example, to connect to a MySQL database, you would use the following code: ```R library(DBI) con <- dbConnect(RMySQL::MySQL(), dbname = "database_name", host = "localhost", port = 3306, user = "username", password = "password") ```

3. How can I retrieve data from a database in R?

Ans. To retrieve data from a database in R, you can use the dbGetQuery() function from the DBI package. This function allows you to execute SQL queries and fetch the result as a data frame. For example, to retrieve all records from a table named "employees", you would use the following code: ```R library(DBI) result <- dbGetQuery(con, "SELECT * FROM employees") ``` The result will be stored in the "result" variable as a data frame.

4. How can I insert data into a database in R?

Ans. To insert data into a database in R, you can use the dbExecute() function from the DBI package. This function allows you to execute SQL statements for data manipulation, such as INSERT, UPDATE, or DELETE. For example, to insert a new record into a table named "employees", you would use the following code: ```R library(DBI) dbExecute(con, "INSERT INTO employees (name, age, salary) VALUES ('John', 30, 5000)") ``` This code will insert a new record with the name "John", age 30, and salary 5000 into the "employees" table.

5. How can I close a database connection in R?

Ans. To close a database connection in R, you can use the dbDisconnect() function from the DBI package. This function allows you to terminate the connection and release any associated resources. For example, to close the previously established connection named "con", you would use the following code: ```R library(DBI) dbDisconnect(con) ``` This code will close the connection and free any memory or system resources used by the connection.

Related Exams

Database Management

About this Video

	4.87/5 Rating
	Nov 24, 2024 Last updated

Video Description: Getting Started With R (R Tutorial 1.3) for Database Management 2024 is part of Mastering R Programming: For Data Science and Analytics preparation. The notes and questions for Getting Started With R (R Tutorial 1.3) have been prepared according to the Database Management exam syllabus. Information about Getting Started With R (R Tutorial 1.3) covers all important topics for Database Management 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Getting Started With R (R Tutorial 1.3).

Introduction of Getting Started With R (R Tutorial 1.3) in English is available as part of our Mastering R Programming: For Data Science and Analytics for Database Management & Getting Started With R (R Tutorial 1.3) in Hindi for Mastering R Programming: For Data Science and Analytics course. Download more important topics related with notes, lectures and mock test series for Database Management Exam by signing up for free.

Description

Video Lecture & Questions for Getting Started With R (R Tutorial 1.3) Video Lecture | Mastering R Programming: For Data Science and Analytics - Database Management - Database Management full syllabus preparation | Free video for Database Management exam to prepare for Mastering R Programming: For Data Science and Analytics.

Information about Getting Started With R (R Tutorial 1.3)

Here you can find the meaning of Getting Started With R (R Tutorial 1.3) defined & explained in the simplest way possible. Besides explaining types of Getting Started With R (R Tutorial 1.3) theory, EduRev gives you an ample number of questions to practice Getting Started With R (R Tutorial 1.3) tests, examples and also practice Database Management tests.

	Mastering R Programming: For Data Science and Analytics 51 videos

Mastering R Programming: For Data Science and Analytics

51 videos

Join Course for Free

Video Timeline

00:20	How to assign values to an object in R
01:46	How to see what is stored in R?
01:57	How to remove an object in R?
02:52	How to assign values to objects in R
03:37	How to do basic arithmetic in R
04:50	How to take the square root of an object in R
05:07	How to use the "log" function in R
05:12	How to take the exponent or anti-log in R?
05:30	How to calculate the absolute value in R?
06:14	Few h&y keyboard shortcuts
06:41	Including comments & notes
More

Explore Courses for Database Management exam

Signup for Free!

Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.

Start learning for Free

10M+ students study on EduRev

video lectures

Summary

practice quizzes

past year papers

Free

Getting Started With R (R Tutorial 1.3) Video Lecture | Mastering R Programming: For Data Science and Analytics - Database Management

study material

Important questions

Objective type Questions

pdf

Viva Questions

MCQs

shortcuts and tricks

Exam

Previous Year Questions with Solutions

mock tests for examination

Sample Paper

ppt

Extra Questions

Getting Started With R (R Tutorial 1.3) Video Lecture | Mastering R Programming: For Data Science and Analytics - Database Management

Semester Notes

;

Study Getting Started With R (R Tutorial 1.3) on the App

Students of Database Management can study Getting Started With R (R Tutorial 1.3) alongwith tests & analysis from the EduRev app, which will help them while preparing for their exam. Apart from the Getting Started With R (R Tutorial 1.3), students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc. The EduRev App will make your learning easier as you can access it from anywhere you want. The content of Getting Started With R (R Tutorial 1.3) is prepared as per the latest Database Management syllabus.

Education Revolution