left_join {tidytable}

Join two data.tables together

Description

Join two data.tables together

Usage

left_join(x, y, by = NULL, suffix = c(".x", ".y"), ..., keep = FALSE)

right_join(x, y, by = NULL, suffix = c(".x", ".y"), ..., keep = FALSE)

inner_join(x, y, by = NULL, suffix = c(".x", ".y"), ..., keep = FALSE)

full_join(x, y, by = NULL, suffix = c(".x", ".y"), ..., keep = FALSE)

anti_join(x, y, by = NULL)

semi_join(x, y, by = NULL)

Arguments

x

A data.frame or data.table

y

A data.frame or data.table

by

A character vector of variables to join by. If NULL, the default, the join will do a natural join, using all variables with common names across the two tables.

suffix

Append created for duplicated column names when using full_join()

...

Other parameters passed on to methods

keep

Should the join keys from both x and y be preserved in the output?

Examples

df1 <- data.table(x = c("a", "a", "b", "c"), y = 1:4)
df2 <- data.table(x = c("a", "b"), z = 5:6)

df1 %>% left_join(df2)
df1 %>% inner_join(df2)
df1 %>% right_join(df2)
df1 %>% full_join(df2)
df1 %>% anti_join(df2)