UNION ALL view ‘%.*ls’ is not updatable because the primary key of table ‘%.*ls’ is not unioned with primary keys of preceding tables.

Error Message:
Msg 4445, Level 16, State 11, Line 1
UNION ALL view ‘%.*ls’ is not updatable because the primary key of table ‘%.*ls’ is not unioned with primary keys of preceding tables.

Severity level:
16.

Description:
This error message appears when you try to update a UNION ALL view but at least one primary key of an underlying base table in unioned with a non primary key of another base table.

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. Primary keys must be unioned with primary keys.

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,
    c2 int
)
GO

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

Remarks:
In the above example we try to update the view dbo.V. Because the primary key of dbo.T is not unioned with the primary key of dbo.T1, the error is raised.




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