This example shows an upsert UPDATE request that does not specify the same primary index value for the UPDATE and INSERT parts of the request.
UPDATE sales SET item_count = item_count + 1 WHERE (item_nbr = 10 AND sale_date = '05/30/2000') ELSE INSERT INTO sales (20, '05/30/2000', 1);
The primary index value specified for the UPDATE and the INSERT must be the same. Otherwise, the operation is looking at two different rows: one for UPDATE and the other for the INSERT. This is not the purpose of the upsert form of UPDATE.
Because the specified primary index values of 10 and 20 are not the same, this case returns an error to the user, indicating that the primary index value must be the same for both the UPDATE and the INSERT.