memdb_frame {dbplyr}R Documentation

Create a database table in temporary in-memory database.

Description

memdb_frame() works like tibble::tibble(), but instead of creating a new data frame in R, it creates a table in src_memdb().

Usage

memdb_frame(..., .name = unique_table_name())

tbl_memdb(df, name = deparse(substitute(df)))

src_memdb()

Arguments

...

<dynamic-dots> A set of name-value pairs. These arguments are processed with rlang::quos() and support unquote via !! and unquote-splice via !!!. Use := to create columns that start with a dot.

Arguments are evaluated sequentially. You can refer to previously created elements directly or using the .data pronoun. An existing .data pronoun, provided e.g. inside dplyr::mutate(), is not available.

df

Data frame to copy

name, .name

Name of table in database: defaults to a random name that's unlikely to conflict with an existing table.

Examples

library(dplyr)
df <- memdb_frame(x = runif(100), y = runif(100))
df %>% arrange(x)
df %>% arrange(x) %>% show_query()

mtcars_db <- tbl_memdb(mtcars)
mtcars_db %>% group_by(cyl) %>% summarise(n = n()) %>% show_query()

[Package dbplyr version 2.1.1 Index]