ALTER TABLE SWITCH statement failed. The table '%.*ls' has clustered index '%.*ls' while the table '%.*ls' does not have clustered index.

Error Message
Msg 4913, Level 16, State 1, Line 1
ALTER TABLE SWITCH statement failed. The table '%.*ls' has clustered index '%.*ls' while the table '%.*ls' does not have clustered index.

Severity level
16

Description
This error message appears, when you try to execute an ALTER TABLE SWITCH command for which only one participating table has a clustered index defined.

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

Resolution
Error of the Severity Level 16 are generated by the user and are corrigible by the user. The statement can not be executed this way. Both, source and target, in an ALTER TABLE SWITCH command must have a clustered index definition.

Versions
This error message was introduced with SQL Server 2005.

Example(s)
USE Pubs
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 PRIMARY KEY
)
ON myPartScheme (c1);

GO
CREATE TABLE myNonPartTable
(
 c1 int
)
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 source table has a clustered index defined on column c1, while the target table has no clustered index definition, the error is raised.