IF NOT EXISTS
   (SELECT *
   FROM    sys.columns
   WHERE   name      = 'CD_MT_DEV_VD' AND
           object_id = OBJECT_ID(N'[dbo].[EST_NF_ENT]')
   )
   ALTER TABLE [DBO].[EST_NF_ENT] ADD CD_MT_DEV_VD [INT] DEFAULT(0)
   