ALTER TABLE SWITCH statement failed. Column ‘%.*ls’ in table ‘%.*ls’ is computed column but the same column in ‘%.*ls’ is not computed.

Error Message:
Msg 4965, Level 16, State 1, Line 2
ALTER TABLE SWITCH statement failed. Column ‘%.*ls’ in table ‘%.*ls’ is computed column but the same column in ‘%.*ls’ is not computed.

Severity level:
16.

Description:
This error message appears when you try to execute an ALTER TABLE SWITCH command, for which a column of the same name is a computed column in one table, but not in the other 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. The column must either be computed or not in both tables.

Versions:
This error message was introduced with SQL Server 2005.

Example(s):
USE Pubs
GO
SET NUMERIC_ROUNDABORT OFF;
SET ANSI_PADDING,
    ANSI_WARNINGS,
    CONCAT_NULL_YIELDS_NULL,
    ARITHABORT,
    QUOTED_IDENTIFIER,
    ANSI_NULLS ON;
GO

CREATE PARTITION FUNCTION myPartFunction (int)
    AS RANGE LEFT FOR VALUES (1, 10, 100);
GO

CREATE PARTITION SCHEME myPartScheme
    AS PARTITION myPartFunction
   ALL TO ([PRIMARY]);
GO

CREATE TABLE myPartTable
(
 c1 int,
 c2 int
)
ON myPartScheme (c1);

GO
CREATE TABLE myNonPartTable
(
 c1 int,
 c2 AS c1 * 2
)
ON [PRIMARY];
GO

ALTER TABLE myPartTable SWITCH PARTITION 1 TO dbo.myNonPartTable ;
GO

DROP TABLE myNonPartTable, myPartTable;
DROP PARTITION SCHEME myPartScheme;
DROP PARTITION FUNCTION myPartFunction;

Remarks:
In the above example we try to execute an ALTER TABLE SWITCH command. Because the column c2 in the target table is computed, but not in the source table, the error is raised.




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