SQL Right Join on Non Unique - sql

Question

I'm hoping that im over thinking this. but i need to sum a column where i have no unique link to join on and when i do it double ups columns.
This is my current SQL that works until i add the join on vwBatchInData then it doubles up every record, what is the best way to achieve this?
select b.fldBatchID as 'ID',SUM(bIn.fldBatchDetailsWeight) as 'Batch In', sum(t.fldTransactionNetWeight) as 'Batch Out' , format((sum(t.fldTransactionNetWeight) / sum(bIn.fldBatchDetailsWeight)),'P2' ) as 'Yield'
from [TRANSACTION] t
right join vwBatchInData bIn on bIn.fldBatchID = t.fldBatchID
inner join Batch b on b.fldBatchID = t.fldBatchID
where CAST(b.fldBatchDate as date) = '2020-03-04'
group by b.fldBatchID**
vwBatchInData Table
+------------+---------------+-----------------------+
| fldBatchID | fldKillNumber | fldBatchDetailsWeight |
+------------+---------------+-----------------------+
| 2862 | 601598 | 164.40 |
| 2862 | 601599 | 190.80 |
| 2862 | 601596 | 195.00 |
| 2862 | 601597 | 200.20 |
| 2862 | 601594 | 176.60 |
+------------+---------------+-----------------------+
Transaction Table
+------------+------------------+-------------------------+
| fldBatchID | fldTransactionID | fldTransactionNetWeight |
+------------+------------------+-------------------------+
| 2862 | 10242352 | 16.26 |
| 2862 | 10242353 | 22.82 |
| 2862 | 10242362 | 18.52 |
| 2862 | 10242363 | 21.44 |
| 2862 | 10242364 | 20.32 |
+------------+------------------+-------------------------+
Batch Table
+------------+-------------------------+
| fldBatchID | fldBatchDate |
+------------+-------------------------+
| 2862 | 2020-03-04 00:00:00.000 |
+------------+-------------------------+
Desired output with the above snipets
+------+----------+-----------+---------+
| ID | Batch In | Batch Out | Yield |
+------+----------+-----------+---------+
| 2862 | 927.00 | 90.36 | 10.76 % |
+------+----------+-----------+---------+

Answer 1

I think you just want to aggregate before joining:
select b.fldBatchID as ID,
(bIn.fldBatchDetailsWeight) as batch_in,
(t.fldTransactionNetWeight) as batch_out,
format(t.fldTransactionNetWeight / bIn.fldBatchDetailsWeight, 'P2' ) as Yield
from batch b left join
(select bin.fldBatchID, sum(fldBatchDetailsWeight) as fldBatchDetailsWeight
from vwBatchInData bin
group by bin.fldBatchID
) bin
on bIn.fldBatchID = b.fldBatchID left join
(select t.fldBatchID, sum(fldTransactionNetWeight) as fldTransactionNetWeight
from transactions t
group by t.fldBatchID
) bin
on t.fldBatchID = b.fldBatchID
where CAST(b.fldBatchDate as date) = '2020-03-04';