R accessing SQL Server Northwind table columns

This post shows you how to access to SQL Server database table using R.

In the previous Connect R to Microsoft SQL Server https://chanmingman.wordpress.com/2018/08/21/connect-r-to-microsoft-sql-server/ article. I showed you how to access to the database. In here we will access to Northwind database tables.

Let’s assign Order Details table to dataFetch.

> dataod <- sqlFetch(cn, 'Order Details', colnames=FALSE, rows_at_time=1000)

To list the table type the following.

> daraod

The list is very long so I cannot see the header. Hence, I create the same table with 10 rows of data.

> dataod <- sqlFetch(cn, ‘OrderDetail10’, colnames=FALSE, rows_at_time=1000)

Display the ProductId column.

> dataod[2]

You can assign the column to variable.

newcol <- dataod[2]

To find out the unique product id in the list you can convert the column to Factor

> pid <- factor(newcol)

> pid

The result display as below.



Levels: c(11, 42, 72, 14, 51, 41, 65, 22, 57)

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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