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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