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dm to anotherAdd a reference from one table of a dm to another
cdm_add_fk(dm, table, column, ref_table, check = FALSE)A dm object.
A table in the dm
The column of table which is to become the foreign key column
referencing the primary key of ref_table.
The table which table is referencing. This table needs to have
a primary key set.
Boolean, if TRUE (default), a check is performed, if the values of
column are a subset of the values of the primary key column of ref_table.
Other foreign key functions: cdm_enum_fk_candidates,
cdm_get_all_fks, cdm_get_fk,
cdm_has_fk, cdm_rm_fk