if not exists (select * from sys.syscolumns where name = 'CreatedByLoggedUserName' AND id = object_id(N'dbo.GroupInfo'))
    alter table dbo.GroupInfo
    add CreatedByLoggedUserName nvarchar(256) null
        ,CreatedByUserName nvarchar(256) null
        ,ModifiedDate datetime null
        ,ModifiedUserName nvarchar(256) null
        ,ModifiedLoggedUserName nvarchar(256) null
        ,Data nvarchar(max) null