In R, I have extensively used the sqldf package, which allows you to execute 
SQL commands on one or more data frames and get the results back as another 
data frame.  You can connect it to different database engines to handle the 
SQL.  Although sqlite is the default, I mostly used PostgreSQL because of it's 
extensive features.  Windowing queries from PostgreSQL, for example, can be a 
really good solution in some circumstances.  

As far as I understand the term, I think this is a good example of language 
oriented programming.  It makes sense to me that Racket should have a way of 
using SQL to directly manipulate data structures.

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