Constraint name ‘%.*ls’ not permitted. Constraint names cannot begin with a number sign (#).

Error Message:
Msg 8166, Level 16, State 0, Line 2
Constraint name ‘%.*ls’ not permitted. Constraint names cannot begin with a number sign (#).

Severity level:
16.

Description:
This error message appears when you try to create a constraint beginning with the # number sign.

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 can be fixed by the SQL Server user. The statement cannot be run this way. You can not create a constraint beginning with the # number sign. You must use another name.

Versions:
All versions of SQL Server.

Example(s):
IF OBJECT_ID(‘dbo.t’) IS NOT NULL
    DROP TABLE dbo.t;
GO

CREATE TABLE dbo.t
(
    c1 int NOT NULL
    CONSTRAINT #PK_t PRIMARY KEY
);

Remarks:
In the above example we try to create a PRIMARY KEY constraint with a name of #PK_t. This raises the error.




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