Msg 4925, Level 16, State 0, Line 1
ALTER TABLE ALTER COLUMN ADD ROWGUIDCOL failed because a column already exists in table ‘%.*ls’ with ROWGUIDCOL property.
This error message appears when you try to alter a column and create the ROWGUIDCOL property on that column of a table that already has a column with that property.
The T-SQL statement can be parsed, but causes the error at runtime.
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. Every table in SQL Server can have just one column with the ROWGUIDCOL property.
All versions of SQL Server.
IF OBJECT_ID(‘tempdb..#t’) > 0
DROP TABLE #t
CREATE TABLE #t
c1 UNIQUEIDENTIFIER ROWGUIDCOL
ALTER TABLE #t
ALTER COLUMN c1 ADD ROWGUIDCOL
In the above example we try to create the ROWGUIDCOL property for the column c1. Because this property has already been created on that column, the error is raised.