How to show two calculated columns to an existing table - sql

Question

I would like to pull a report that will add two columns to the first two columns of an existing table (Shipment_Info). Shipment_Info has three columns ShipmentID and ItemID and Item_Status. ItemID values are always unique, but ShipmentIDs will repeat because different Items can be in the same shipment, and item status can be in different states (Allocated, Filled and Packed)
I want to run a query that will add two column to the existing table (first two columns). The first new column (Shipment_Size) will show how many unique items there are in that specific shipmentID, and the 2nd new column (Shipment_ready) will show if the entire shipmentID is ready to be shipped. For an shipmentID to be ready to be ItemIDs must be in a "Packed" status. Any help would be greatly appreciated.
DB Table: Shipment_INFO
ShipmentID
ItemID
Item_status
10001
20001
Packed
10002
20002
Allocated
10002
20003
Packed
10003
20004
Filled
10004
20005
Packed
10004
20006
Packed
10004
20007
Packed
10005
20008
Filled
10005
20009
Packed
10006
20010
Filled
Ideal output.
ShipmentID
ItemID
Shipment_Size
Shipment_Ready
10001
20001
1
Yes
10002
20002
2
No
10002
20003
2
No
10003
20004
1
No
10004
20005
3
Yes
10004
20006
3
Yes
10004
20007
3
Yes
10005
20008
2
No
10005
20009
2
No
10006
20010
1
No
Someone help me with getting the Shipment_Size using this query, but I'm struggling to figure out how to integrate the the Shipment_Packed column to the query below.
select s.shipmentID, s.ItemID, i.Shipment_Size
from Shipment_INFO s
inner join ( select shipmentID, count(*) as Shipment_Size
from Shipment_INFO
group by shipmentID ) i on i.shipmentID=s.shipmentID`

Answer 1

Something like this should work
select
shipmentid,
itemid,
count(*) over (partition by shipmentid) as shipment_size,
case
when (
select count(*) from shipment_info si2
where si2.shipmentid = si.shipmentid
and si2.item_status = 'Packed'
) = count(*) over (partition by shipmentid)
then 'Yes'
else 'No'
end as shipment_ready
from
shipment_info si
or:
with
shipment_status as (
select
shipmentid,
count(1) as shipment_size,
sum(case item_status when 'Packed' then 1 else 0 end) as packed_count
from
shipment_info
group by
shipmentid
)
select
si.shipmentid,
si.itemid,
ss.shipment_size,
case ss.packed_count
when ss.shipment_size then 'Yes'
else 'No'
as shipment_ready
from
shipment_info si
join
shipment_status ss on ss.shipmentid = si.shipmentid

Answer 2

example for you :
select ShipmentID,ItemID,
count(ItemID) over (partition by ShipmentID) Shipment_Size,
case when
sum(case when Item_status='Packed' then 1 else 0 end) OVER (partition by ShipmentID ) =count(ItemID) over (partition by ShipmentID)
then 'Yes' else 'no' end as Shipment_Ready
from Shipment_INFO
group by ShipmentID,Item_status,ItemID
demo :https://dbfiddle.uk/80HA0Njd

Answer 3

You want to select all rows, but for each row look at its whole shipment. To do this use analytic funtions with OVER (PARTITION BY shipmentid):
select
shipmentid,
itemid,
count(*) over (partition by shipmentid) as shipment_size,
min(item_status) over (partition by shipmentid) = 'Packed' as shipment_ready
from shipment_info
order by itemid;
I am using a trick here. 'Packed' is the last status in alphabetical order. So if the minimum status for a shipment is 'Packed', then all its items are packed and the shipment is ready.