Can't order query correctly - sql

Question

A while ago I requested help to code a LEFT JOIN filtering in a particular way that the result postition the desired value in the first row.
Need to retrieve table's last inserted/updated record with some exclusions
The thing now is that there are many cases which are mixing data. The scenario is that on the same table we have 2 values that we need to organize on different columns. The PO_ID is unique, but can have 1 or more values on the other tables, and for this particular case 1 PO_ID has 3 SHIP_ID_CUS values. We only need 1 PO_ID per row (no duplicates) that is way we used the MAX() and GROUP BY.
Here is a piece of the code that I think cause issues.
select
z.po_id,
max(scdc.ship_id) as ship_id_cdc,
max(lscdc.ship_evnt_cd) as last_event_cdc,
max(lscdc.ship_evnt_tms) as event_tms_cdc,
max(scus.SHIP_ID) as ship_id_cus,
max(lscus.ship_evnt_cd) as last_event_cus,
max(lscus.ship_evnt_tms) as event_tms_cus
from TABLE.A z
left join (select distinct po_id, iltc.ship_id, s.ship_to_loc_code from TABLE.B iltc inner join TABLE.C s on iltc.ship_id=s.ship_id and iltc.ship_to_loc_code=s.ship_to_loc_code and s.ship_to_ctry<>' ') AS A ON z.po_id = a.po_id
left JOIN TABLE.C scus ON A.SHIP_ID = scus.SHIP_ID AND A.SHIP_TO_LOC_CODE = scus.SHIP_TO_LOC_CODE and scus.loc_type = 'CUS' AND DAYS(scus.shipment_tms)+10 >= DAYS(z.ship_tms)
left JOIN TABLE.C scdc ON A.SHIP_ID = scdc.SHIP_ID AND A.SHIP_TO_LOC_CODE = scdc.SHIP_TO_LOC_CODE and scdc.loc_type = 'CDC' AND DAYS(scdc.shipment_tms)+10 >= DAYS(z.ship_tms)
left join
( select ship_id_856, ship_to_loc_cd856, ship_evnt_cd, ship_evnt_tms, carr_tracking_num, event_srv_lvl
, row_number() over(partition by ship_id order by updt_job_tms desc) as RN
FROM TABLE.D
WHERE LEFT(ship_evnt_cd, 1) <> '9') lscus
ON lscus.ship_id_856=scus.ship_id and scus.ship_to_loc_code=lscus.ship_to_loc_cd856 and lscus.rn = 1
left join
( select ship_id_856, ship_to_loc_cd856, ship_evnt_cd, ship_evnt_tms, carr_tracking_num, event_srv_lvl
, row_number() over(partition by ship_id order by updt_job_tms desc) as RN
FROM TABLE.D
WHERE LEFT(ship_evnt_cd, 1) <> '9') lscdc
ON lscdc.ship_id_856=scdc.ship_id and lscdc.ship_to_loc_cd856=scdc.ship_to_loc_code and lscdc.rn = 1
WHERE
z.po_id = 'T1DLDC'
GROUP BY z.po_id
By searching that condition we get the following result
The problem is that if we search directly on the TABLE.D, the last event that we need (with last update record tms) is another one (X1) and somehow the date is incorrect.
What is even more weird, is that if we search for the ship_id_cus on the original query, we get the correct code but still with a wrong date...
WHERE
--z.po_id = 'T1DLDC'
scus.ship_id = 'D30980'
GROUP BY z.po_id
I tried other logic changes like modifying the left joins to search on a subquery.
left JOIN ( select * from TABLE.C order by updt_job_tms desc) scus ON A.SHIP_ID = scus.SHIP_ID AND A.SHIP_TO_LOC_CODE = scus.SHIP_TO_LOC_CODE and scus.loc_type = 'CUS' AND DAYS(scus.shipment_tms)+10 >= DAYS(z.ship_tms)
But this is also giving the same exact results by searching either by po_id or ship_id_cus
Any ideas or comment will be much appreciated.
Thanks
------------------------------------UPDATE-----------------------------------
Adding the result of the LEFT JOIN with the row_partition() including all the ship_id_cus for that po_id, and all the codes with the tms. None match here.
Based on all these, it should be the last ship_id_cus with X1 event/tms. If we exclude also the ones starting with 9, we would get the following result.
(I am not applying here ordering by ship_id_cus, which already described before that did not work either the way I implemented)

Answer 1

If you have a table: TBL1
ID APPROVED APPROVER DATE_APPROVED
====== ======== ======== =============
ABC Y JOE 2019-01-13
ABC N ZACK 2018-12-23
ABC N SUE 2019-02-23
And you do SQL:
SELECT ID, MAX(APPROVED) AS APPROVAL
,MAX(APPROVER) AS APPROVED_BY , MAX(DATE_APPROVED) AS APPROVED_ON
FROM TBL1 GROUP BY ID
you will get result:
ID APPROVAL APPROVED_BY APPROVED_ON
====== ======== =========== =============
ABC Y ZACK 2019-02-23
which is correct to the code but is NOT what you want
Try the following:
SELECT T1.ID, T1.APPROVED, T1.APPROVER, T1.DATE_APPROVED
FROM TBL1 AS T1
INNER JOIN (SELECT ID, MAX(DATE_APPROVED) AS APPROVED_ON
FROM TBL1 GROUP BY ID
) AS T2
ON T1.ID =T2.ID
AND T1.DATE_APPROVED = T2.APPROVED_ON
Result:
ID APPROVED APPROVER DATE_APPROVED
====== ======== ======== =============
ABC N SUE 2019-02-23