How find just one record on the table

Hi,
I've this table TAB_DV:
COD_ID.........DV_ID
001............A
002............A
002............B
002............C
002.............
003............
004............GG
004............DD
004............FF
004............MM
004............TT
008.............BB
0022..............
0033..............
0044............A
0044............
0055............FF
0066............
I'd like to find only the COD_ID that have one record (in the table TAB_DV) without dv_id:
In my case:
COD_ID.........DV_ID
003............
0022..............
0033..............
0066............
If I run:
SELECT COD_ID, DV_ID
FROM TAB_DV
WHERE DV_ID IS NULL
GROUP BY COD_ID, DV_ID;
I get also COD_ID with more records.
How can I write this query?
Thanks in advance.

try this
select cod_id
  from tab_dv
where dv_id is null
having count(cod_id) = 1
group by cod_id
or
select t1.cod_id, t1.dv_id
  from tab_dv t1
where t1.cod1 in (select cod_id
                     from tab_dv t2
                   having count(t2.cod_id) = 1
                   group by t2.cod_id)
   and t1.dv_id is null

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