Profiling dataframes in R

We will revisit the same dataset from Chapter 4, Creating Bar Charts with D3.js; however, this time it will be retrieved using a SQL statement as opposed to a CSV file. The following SQL statement will return the same data for discount codes by week:

SELECT [WeekInYear] 
       ,[DiscountCode] 
   FROM [AdventureWorks2014].[dbo].[DiscountCodebyWeek] 

We can incorporate this same SQL statement inside of a dataframe within R by using the following script:

SQL_Query_1<-sqlQuery(connection_SQLBI,
            'SELECT [WeekInYear]
            ,[DiscountCode]
            FROM [AdventureWorks2014].[dbo].[DiscountCodebyWeek]' )

A dataframe is merely a dataset organized by columns, and the simplest way to get the results of a dataframe is to execute the following script, which will return the first six rows of the dataset:

head(SQL_Query_1) 

In addition to retrieving the first few rows of the dataset, we can identify the structure of the...