UNION ALL view ‘%.*ls’ is not updatable because a primary key was not found on table ‘%.*ls’.

Error Message:
Msg 4440, Level 16, State 9, Line 1
UNION ALL view ‘%.*ls’ is not updatable because a primary key was not found on table ‘%.*ls’.

Severity level:
16.

Description:
This error message appears when you try to update a UNION ALL view but at least one underlying base table does not have a PRIMARY KEY constraint.

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 base tables in a UNION ALL view must have PRIMARY KEY constraints.

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
)
GO

CREATE TABLE dbo.T1
(
    c1 int
)
GO

CREATE VIEW dbo.V
AS
SELECT
    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 underlying base tables dbo.T and dbo.T1 have no PRIMARY KEY constraints defined, the error is raised.




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One Response to “UNION ALL view ‘%.*ls’ is not updatable because a primary key was not found on table ‘%.*ls’.”

  1. This one should read:
    UNION ALL view ‘%.*ls’ is not updatable because a primary key was not found on table or view ‘%.*ls’.
    I encountered this when unioning a table and a view, and the underlying table behind the view does have a primary key.

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