Cannot create the foreign key “%.*ls” with the SET DEFAULT referential action, because one or more referencing not-nullable columns lack a default constraint.

Error Message:
Msg 1762, Level 16, State 0, Line 3
Cannot create the foreign key “%.*ls” with the SET DEFAULT referential action, because one or more referencing not-nullable columns lack a default constraint.

Severity level:
16.

Description:
This error message appears when you try to create a foreign key constraint with the referential SET DEFAULT action, but the referencing column has no DEFAULT constraint defined on it.

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

Resolution:
Errors of the Severity Level 15 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. Either the referential action must be changed or the referencing column must have a DEFAULT constraint defined on it.

Versions:
All versions of SQL Server.

Example(s):
IF OBJECT_ID (‘dbo.T1′) IS NOT NULL
    DROP TABLE dbo.T1;
GO
IF OBJECT_ID (‘dbo.T2′) IS NOT NULL
    DROP TABLE dbo.T2;
GO

CREATE TABLE dbo.T1 (c1 int NOT NULL PRIMARY KEY);
CREATE TABLE dbo.T2 (c1 int NOT NULL PRIMARY KEY
    CONSTRAINT FK_T2_T1 FOREIGN KEY REFERENCES dbo.T1 (c1)
        ON DELETE SET DEFAULT
);

Remarks:
In the abve example we try to create a foreign key constraint with the referential SET DEFAULT action on dbo.T2 (c1) that references dbo.T1 (c1). Because c1 has no DEFAULT constraint defined, the error is raised.



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