SQL Select Distinct based on Conditional - sql

Question

Assumptions:
ITEM STATUS in STAGINGLINE: 0 - NOT STARTED, 1 - VERIFIED, 2 - MISCOUNT
Want only one line to show per ASN so easiest way is using DISTINCT....
SELECT DISTINCT ASN, STATUS
FROM STAGINGLINE
However, I can't use a simple distinct because of the multiple STATUS possibilities, you would get multiples for each status.
Result set should show only 2 “ASNs”: 123 and 343
Example STAGINGLINE Table
Case 1:
(ASN #, ITEM #, STATUS, QTY ,ACTUAL)
123 898 0 4 NULL
123 344 0 9 NULL
123 123 0 2 NULL
123 534 0 1 NULL
343 111 1 6 6
ResultSet needs to be:
123 NOT STARTED (because all 0)
343 VERIFIED
Case 2:
(ASN #, ITEM #, STATUS, QTY ,ACTUAL)
123 898 1 4 4
123 344 0 9 NULL
123 123 0 2 NULL
123 534 0 1 NULL
ResultSet needs to be:
123 IN PROGRESS (because at least one of them is not in a 0 STATUS)
343 VERIFIED
Case 3:
(ASN #, ITEM #, STATUS, QTY ,ACTUAL)
123 898 1 4 4
123 344 2 9 5 <- MISCOUNT
123 123 0 2 NULL
123 534 0 1 NULL
ResultSet needs to be:
123 MISCOUNT (because of the existence of a 2 in at least one of the STATUS column)
343 VERIFIED
Case 4:
(ASN #, ITEM #, STATUS, QTY ,ACTUAL)
123 898 1 4 4
123 344 1 9 9
123 123 1 2 2
123 534 1 1 1
ResultSet needs to be:
123 VERIFIED (because all are STATUS of 1)
343 VERIFIED

Answer 1

Are you looking for max():
select asn, max(status)
from t
group by asn;
Or perhaps max() with case:
select (case max(status) when 0 then 'NOT STARTED'
when 1 then 'VERIFIED'
when 2 then 'MISCOUNT'
end)
from t
group by asn;
EDIT:
The rules seem a bit more detailed:
select (case when max(status) = 0 then 'NOT STARTED'
when max(status) = 1 and min(status) = max(status) then 'VERIFIED'
when max(status) = 2 then 'MISCOUNT'
else 'IN PROGRESS'
end)
from t
group by asn;

Answer 2

Can you try this,
SELECT ASN,
CASE WHEN MAX_STATUS = 2 THEN 'MISCOUNT'
WHEN MAX_STATUS = 0 THEN 'NOT STARTED'
WHEN MAX_STATUS = 1 AND MIN_STATUS = 1 THEN 'VERIFIED'
WHEN MAX_STATUS = 1 AND MIN_STATUS = 0 THEN 'IN-PROGRESS'
END STATUS
FROM
(SELECT ASN, MAX(STATUS) MAX_STATUS, MIN(STATS) MIN_STATUS
FROM STAGELINE
GROUP BY ASN) A