Overview

dbplyr is the database backend for dplyr. It allows you to use remote database tables as if they are in-memory data frames by automatically converting dplyr code into SQL.

To learn more about why you might use dbplyr instead of writing SQL, see vignette("sql"). To learn more about the details of the SQL translation, see vignette("translation-verb") and vignette("translation-function").

Usage

dbplyr is designed to work with database tables as if they were local data frames. To demonstrate this I’ll first create an in-memory SQLite database and copy over a dataset:

library(dplyr, warn.conflicts = FALSE)

con <- DBI::dbConnect(RSQLite::SQLite(), ":memory:")
copy_to(con, mtcars)

Note that you don’t actually need to load dbplyr with library(dbplyr); dplyr automatically loads it for you when it sees you working with a database. Database connections are coordinated by the DBI package. Learn more at http://dbi.r-dbi.org/

Now you can retrieve a table using tbl() (see ?tbl_dbi for more details). Printing it just retrieves the first few rows:

All dplyr calls are evaluated lazily, generating SQL that is only sent to the database when you request the data.