I am trying to update a table wihch has a single Primary key and a number of foreign key fields - the foreign key fields have properties of: Required = No, Indexed = Yes (Duplicates OK) and Default value = NULL. When I try to UPDATE this table supplying the primary key and one or several of the foreign keys I get a Key violation error. If the FKs allow nulls, I am bemused why this should occur ? Any ideas anyone ?
The PK I am supplying id definitly unique.
If I dont supply any of the FKs I dont get a key violation and the table updates.
I am enforcing referential integrity between the primary and foreign key tables.