SQL Server为字段添加默认值

if not exists (

      select *

      from   sys.columns as c

             join sys.objects as o on c.default_object_id = o.[object_id]

             where c.[object_id] = object_id('DriverTable')

             and c.name = 'DriverVan'

   )

begin

    alter table DriverTable

    add default(0) for DriverVan

    with values

end

else

    print 'default value for DriverVan exists'

go