Right button on TCHARTABLE --> Design Table, and now go in Trigger, set all like the image.
Now delete all from Definition and put this script into.
Code:
BEGIN
DECLARE @oldname VARCHAR(255)
DECLARE @newname VARCHAR(255)
SELECT @oldname = szNAME FROM DELETED
SELECT @newname = szNAME FROM INSERTED
IF(@oldname != @newname)
BEGIN
ROLLBACK;
END
END






