The Type of foreign key fields describes what the foreign key fields in the foreign key table mean.
The following types of foreign key field can be defined:
- No key fields/candidates:
The foreign key fields are neither primary key fields of the foreign key table nor do they uniquely identify a record of the foreign key table (key candidates). For this reason, the foreign key fields do not (partially) identify the foreign key table.
- Key fields/candidates:
The foreign key fields are either primary key fields of the foreign key table or they already uniquely identify a record of the foreign key table (key candidates). The foreign key fields therefore (partially) identify the foreign key table.
- Key fields of a text table:
The foreign key table is a
Type of Foreign Key Fields 