Column ‘%.*ls.%.*ls’ is not of same collation as referencing column ‘%.*ls.%.*ls’ in foreign key ‘%.*ls’.

Error Message:
Msg 1757, Level 16, State 0, Line 4
Column ‘%.*ls.%.*ls’ is not of same collation as referencing column ‘%.*ls.%.*ls’ in foreign key ‘%.*ls’.

Severity level:
16.

Description:
This error message appears when you try to define a foreign key constraing on columns having different collations.

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. Columns in a foreign key constraint must be of the same collation.

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 (c2 varchar(20) COLLATE Albanian_BIN NOT NULL PRIMARY KEY);

CREATE TABLE dbo.T2 (c2 varchar(20) COLLATE SQL_Scandinavian_CP850_CI_AS
    CONSTRAINT FK_T2_T1 FOREIGN KEY REFERENCES dbo.T1 (c2)
        
);

Remarks:
In the above example we try to define a foreign key constraint on columns having a different collation. This raises the error.



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