dm (version 0.0.6)

dm_get_pk: Retrieve the name of the primary key column of a dm table

Description

dm_get_pk() returns the name of the column marked as primary key of a table of a dm object. If no primary key is set for the table, an empty character vector is returned.

Usage

dm_get_pk(dm, table)

Arguments

dm

A dm object.

table

A table in the dm.

Value

A character vector with the column name(s) of the primary key of table.

See Also

Other primary key functions: dm_add_pk(), dm_get_all_pks(), dm_has_pk(), dm_rm_pk(), enum_pk_candidates()

Examples

# NOT RUN {
library(dplyr)
nycflights_dm <- dm_nycflights13()

nycflights_dm %>%
  dm_get_pk(planes)
# }