Building Dynamic Row Headers With ML Services

Dave Mason tries to get around his RESULT SETS limitation when using SQL Server Machine Learning Services:

The columns in the data frame clearly have names, but SQL Server isn’t using them. The data frame columns have types in R too (more on this in a moment). Now that makes me wonder about the data types for the data returned by SQL. How is that determined? If SQL isn’t using the column names, can I assume it isn’t making use of the R column types either?

For a point of reference, let’s run some more R code to show the column names and types. As before, the rvest package is used to scrape a web page, with each HTML <table> found becoming a data frame in the “tables” list (line 3). A data frame of table metadata is created by calling data.frame(). The first parameter is a vector of column names (line 4), the second parameter is a vector of column classes (line 5), and the third parameter causes the row “names” to be incrementing digits (line 6).

This is a work in progress as Dave continues his series.

Related Posts

R In Linux For Windows

David Smith shows how to install and use R in the Windows Subsystem for Linux: R has been available for Windows since the very beginning, but if you have a Windows machine and want to use R within a Linux ecosystem, that’s easy to do with the new Fall Creator’s Update (version 1709). If you […]

Read More

A Hack For Dynamic ML Services Result Sets

Dave Mason has put together a solution to his dynamic data frame naming problem: We can take those names and R types, string them together, and “convert” them to SQL data types. (Mapping data types from one language to another is waaaay outside the scope of this post. Lines 11-13 are quick and dirty, just […]

Read More

Categories

November 2017
MTWTFSS
« Oct Dec »
 12345
6789101112
13141516171819
20212223242526
27282930