dm_has_pk: Check for primary key

In dm: Relational Data Models

Check for primary key

Description

dm_has_pk() checks if a given table has columns marked as its primary key.

Usage

dm_has_pk(dm, table, ...)

Arguments

dm	A dm object.
table	A table in the dm.
...	These dots are for future extensions and must be empty.

Value

A logical value: TRUE if the given table has a primary key, FALSE otherwise.

See Also

Other primary key functions: dm_add_pk(), dm_add_uk(), dm_get_all_pks(), dm_get_all_uks(), dm_rm_pk(), dm_rm_uk(), enum_pk_candidates()

Examples

dm_nycflights13() %>%
  dm_has_pk(flights)
dm_nycflights13() %>%
  dm_has_pk(planes)

dm documentation built on July 2, 2025, 5:09 p.m.