text: 
   IF NOT EXISTS(SELECT * FROM sys.columns 
            WHERE Name = N'Billing'
            AND Object_ID = Object_ID(N'mst_Facility'))
  BEGIN
  ALTER TABLE mst_Facility
  ADD Billing int null
  END
  
  go
  
  
   IF NOT EXISTS(SELECT * FROM sys.columns 
            WHERE Name = N'Wards'
            AND Object_ID = Object_ID(N'mst_Facility'))
  BEGIN
  ALTER TABLE mst_Facility
  ADD Wards int null
  END