How to query SQLite to find sum, latest record, grouped by id, in between dates? - sql

Question

Items (itemId, itemName)
Logs (logId, itemId, qtyAdded, qtyRemoved, availableStock, transactionDate)
Sample Data for Items:
itemId itemName
1 item 1
2 item 2
Sample Data for Logs:
logid itemId qtyAdded qtyRemoved avlStock transDateTime
1 2 5405 0 5405 June 1 (4PM)
2 2 1000 0 6405 June 2 (5PM)
3 2 0 6000 405 June 3 (11PM)
I need to see all items from Items table and their SUM(qtyAdded), SUM(qtyRemoved), latest availableStock (there's an option for choosing the range of transactionDate but default gets all records). Order of date in final result does not matter.
Preferred result: (without date range)
itemName qtyAddedSum qtyRemovedSum avlStock
item 1 6405 6000 405
item 2 <nothing here yet>
With date Range between June 2 (8AM) and June 3 (11:01PM)
itemName qtyAddedSum qtyRemovedSum avlStock
item 1 1000 6000 405
item 2 <no transaction yet>
So as you can see, final result is grouped which makes almost all my previous query correct except my availableStock is always wrong. If I focus in the availableStock, I can't get the two sums.

Answer 1

you could use group by sum, and between
select itemName, sum(qtyAdded), sum(qtyRemoved), sum(avlStock)
from Items
left join Logs on logs.itemId = items.itemId
where transDateTime between '2017-06-02 08:00:00' and '2017-06-03 23:00:00'
group by itemId
or
If you need the last avlStock
select itemName, sum(qtyAdded), sum(qtyRemoved), tt.avlStock
from Items
left join Logs on logs.itemId = items.itemId
INNER JOIN (
select logid,avlStock
from logs
inner join (
select itemId, max(transDateTime) max_trans
from Logs
group by itemId
) t1 on logs.itemId = t1.ItemId and logs.transDateTime = t1.max_trans
) tt on tt.logId = Logs.itemId
where transDateTime between '2017-06-02 08:00:00' and '2017-06-03 23:00:00'
group by itemId

Answer 2

Okay, I tried both of these and they worked, can anyone confirm if these are already efficient or if there are some more efficient answers there.
SELECT * FROM Items LEFT JOIN
(
SELECT * FROM Logs LEFT JOIN
(
SELECT SUM(qtyAdd) AS QtyAdded, SUM(qtySub) AS QtyRemoved, availableStock AS Stock
FROM Logs WHERE transactionDate BETWEEN julianday('2017-07-18 21:10:40')
AND julianday('2017-07-18 21:12:00') GROUP BY itemId
)
ORDER BY transactionDate DESC
)
USING (itemId) GROUP BY itemName;
SELECT * FROM Items LEFT JOIN
(
SELECT * FROM Logs LEFT JOIN
(
SELECT SUM(qtyAdd) AS QtyAdded, SUM(qtySub) AS QtyRemoved, availableStock AS Stock
FROM Logs GROUP BY itemId
)
ORDER BY transactionDate DESC
)
USING (itemId) GROUP BY itemName;