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  1. User Guides
  2. Data guides

Accessing data as data.frames in R

PreviousA complete database research workflow (Matlab & RStudio)NextWorking with CRSP and Compustat

Last updated 2 years ago

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If you are not keen on using SQL syntax and your database setup is fairly straightforward, there is no need to write queries in SQL to get data into your R application. The dbplyr package lets your write your package in tidyverse friendly syntax, please refer to the package vignette .

In order to use dbplyr you need to take the following steps:

  1. Install the dbplyr package by typing install.packages("dbplyr") into your R shell.

  2. Once you've installed the package, you can use the nuvolos::get_connection() call to obtain a connection that you can feed to tbl.

As an example, the following code queries the test database table, selects two columns and filters for records where V2 > 0.

con <- nuvolos::get_connection()
data <- dplyr::tbl(con, "test")
data %>% dplyr::select(V1, V2) %>% dplyr::filter(V2 > 0)

The equivalent SQL statement would be:

SELECT V1, V2 FROM "test"
WHERE V2 > 0;

here