Access Query Loop Update - sql

Question

I have a table with purchase orders, and all POs could have several entries with different items associated.
PO
PN
Status
1
A
Open
1
B
progress
1
C
Delivered
2
A
Open
3
A
Delivered
3
A
Delivered
From this master data Table, I would like to create a overview table, with just one entry per PO and only one Status information, according certain criteria.
Criteria example:
if one item is in PROGRESS or DELIVERED set PO status as PROGRESS
if one item is in OPEN (But don't exist PROGRESS) set PO Status as OPEN.
if all item is in PROGRESS or DELIVERED or OPEN set PO Status as PROGRESS or DELIVERED or OPEN accordingly.
OVERVIEW TABLE Example:
PO
Status
1
PROGRESS
2
OPEN
3
Delivered

Answer 1

I will offer one approach to consider. Assuming there are only 3 status categories:
Query1:
SELECT OrderDetails.PO,
Count(OrderDetails.PN) AS CntPN,
Sum(IIf([Status]="Progress",1,0)) AS CntP,
Sum(IIf([Status]="Open",1,0)) AS CntO,
Sum(IIf([Status]="Delivered",1,0)) AS CntD
FROM OrderDetails
GROUP BY OrderDetails.PO;
Query2:
SELECT Query1.PO, Switch([CntP]=[CntPN],"Progress", [CntO]=[CntPN],"Open", [CntD]=[CntPN],"Delivered", CntO>0 AND CntP=0,"Open", CntP>0 Or CntD>0,"Progress", True,Null) AS S
FROM Query1;
Query1 could be a CROSSTAB instead of using IIf() expressions to emulate. CROSSTAB will return Null instead of 0 so would have to deal with that. Then adjust Query2 structure for different field names.
Anything else will probably need a VBA custom function.