Connect to a database

Intermediate Importing Data in R

Filip Schouwenaars

Instructor, DataCamp

Up to now

Flat files
Excel files

Relational Databases

What is a relational database?
How to connect?
How to read table?

company

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company

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company

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company

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company

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company

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company

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company

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Database Management System

DBMS
Open source
- MySQL, PostgreSQL, SQLite
Proprietary
- Oracle Database, Microsoft SQL Server
SQL = Structured Query Language

Databases in R

Different R packages
MySQL: RMySQL
PostgresSQL: RPostgresSQL
Oracle Database: ROracle
Conventions specified in DBI

install.packages("RMySQL")

library(DBI)   
# library(RMySQL) not required

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Connect to database

con <- dbConnect(RMySQL::MySQL(), # Construct SQL driver
           dbname = "company",
           host = "courses.csrrinzqubik.us-
                            east-1.rds.amazonaws.com",
           port = 3306,
           user = "student",
           password = "datacamp")

con is DBIConnection object

Let's practice!

Intermediate Importing Data in R