Question : UNION all view % is not updatable because a partitioning column was not found

I have 2 tables - SorMaster and ShippingPlanAddOnsTest.  The second one I created by copying the first one into a new table.  I have deleted all of the records from the ShippingPlanAddOnsTest table.

SalesOrder is the primary key - for both tables.

The first table has a constraint as follows: SalesOrder < 909999

The second table has a constraint as follows: SalesOrder > 910000

I have created a view of these tables as follows -

CREATE VIEW QMM_ShippingPlanViewTest
AS
SELECT * FROM dbo.SorMaster
Union ALL
SELECT * from QMM_ShippingPlanAddOnsTest

Why do I get the "UNION all view QMM_ShippingPlanViewTest is not updatable because a partitioning column was not found" error.  I have a primary key in each table, they are the same field, and they both have a constraint on them.

I am looking to be able to add records AND update data in existing records via the view.    

NOTE: I have reviewed MS article 270013, which addresses untrusted constraints.  After running the script, it appears that my constraints on these 2 tables are trusted.

Answer : UNION all view % is not updatable because a partitioning column was not found

It cannot be done. See here from BOL:


If a view does not have INSTEAD OF triggers, or if it is not a partitioned view, then it is updatable only if the following conditions are satisfied:

The select_statement has no aggregate functions in the select list and does not contain the TOP, GROUP BY, UNION (unless the view is a partitioned view as described later in this topic), or DISTINCT clauses. Aggregate functions can be used in a subquery in the FROM clause as long as the values returned by the functions are not modified. For more information, see Aggregate Functions.

select_statement has no derived columns in the select list. Derived columns are result set columns formed by anything other than a simple column expression, such as using functions or addition or subtraction operators.

The FROM clause in the select_statement references at least one table. select_statement must have more than non-tabular expressions, which are expressions not derived from a table. For example, this view is not updatable:
CREATE VIEW NoTable AS
SELECT GETDATE() AS CurrentDate,
       @@LANGUAGE AS CurrentLanguage,
       CURRENT_USER AS CurrentUser