UNION ALL view ‘%.*ls’ is not updatable because the primary key of table ‘%.*ls’ is not included in the union result.

Error Message:
Msg 4444, Level 16, State 10, Line 1
UNION ALL view ‘%.*ls’ is not updatable because the primary key of table ‘%.*ls’ is not included in the union result.

Severity level:
16.

Description:
This error message appears when you try to update a UNION ALL view but the primary key of at least one underlying base table is not contained in the union result.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Errors of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. The primary key of each underlying base table must be contained in the union result.

Versions:
All versions of SQL Server.

Example(s):
IF OBJECT_ID (‘dbo.T’) IS NOT NULL
    DROP TABLE dbo.T;
GO
IF OBJECT_ID (‘dbo.T1’) IS NOT NULL
    DROP TABLE dbo.T1;
GO
IF OBJECT_ID (‘dbo.V’) IS NOT NULL
    DROP VIEW dbo.V;
GO

CREATE TABLE dbo.T
(
    c1 int PRIMARY KEY,
    c2 int
)
GO

CREATE TABLE dbo.T1
(
    c1 int PRIMARY KEY
)
GO

CREATE VIEW dbo.V
AS
SELECT
    c2 AS c1
FROM
    dbo.T
UNION ALL
SELECT
    c1
FROM
    dbo.T1;
GO
UPDATE dbo.V
    SET
    c1 = 1;

Remarks:
In the above example we try to update the view dbo.V. Because the primary key of the underlying base tables dbo.T is not contained in the union result, the error is raised.




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