dm_rm_uk: Remove a unique key

In dm: Relational Data Models

Remove a unique key

Description

dm_rm_uk() removes one or more unique keys from a table and leaves the dm object otherwise unaltered. An error is thrown if no unique key matches the selection criteria. If the selection criteria are ambiguous, a message with unambiguous replacement code is shown. Foreign keys are never removed.

Usage

dm_rm_uk(dm, table = NULL, columns = NULL, ...)

Arguments

dm	A dm object.
table	A table in the dm. Pass NULL to remove all matching keys.
columns	Table columns, unquoted. To refer to a compound key, use c(col1, col2). Pass NULL (the default) to remove all matching keys.
...	These dots are for future extensions and must be empty.

Value

An updated dm without the indicated unique key(s).

See Also

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

dm documentation built on May 29, 2024, 11:41 a.m.