Cannot create the foreign key ‘%.*ls’ because the referenced column ‘%.*ls.%.*ls’ is a non-persisted computed column.

Error Message:
Msg 1784, Level 16, State 1, Line 9
Cannot create the foreign key ‘%.*ls’ because the referenced column ‘%.*ls.%.*ls’ is a non-persisted computed column.

Severity level:
16.

Description:
This error message appears when you try to create a foreign key constraint referencing a non-persisted computed column.

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. You cannot create a foreign key constraint referencing a non-persisted computed column.

Versions:
All versions of SQL Server.

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

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

CREATE TABLE dbo.T1
(
    c1 int NOT NULL PRIMARY KEY,
    c2 AS 1 * c1
    CONSTRAINT UQ UNIQUE
);

CREATE TABLE dbo.T2 (c1 int NOT NULL PRIMARY KEY
    CONSTRAINT FK_T2_T1 FOREIGN KEY REFERENCES dbo.T1 (c2));

Remarks:
In the abve example we try to create a foreign key constraint referencing a non-persisted computed column. This raises the error.



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