ALTER TABLE SWITCH statement failed. Check constraints or partition function of source table ‘%.*ls’ allows values that are not allowed by check constraints or partition function on target table ‘%.*ls’.

Error Message:
Msg 4972, Level 16, State 1, Line 2
ALTER TABLE SWITCH statement failed. Check constraints or partition function of source table ‘%.*ls’ allows values that are not allowed by check constraints or partition function on target table ‘%.*ls’.

Severity level:
16.

Description:
This error message appears when you try to execute an ALTER TABLE SWITCH command, for which the target table has a CHECK constraint that the source table is missing or for which a CHECK constraint of the same name has a different definition.

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. Source and target table must have identical CHECK constraints.

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
)
ON myPartScheme (c1);

GO
CREATE TABLE myNonPartTable
(
 c1 int
 CONSTRAINT chk_myNonPartTable_c1 CHECK(c1<>0)
)
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 target has a CHECK constraint, that the source table is missing, the error is raised.




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