Oracle find shareholders sub query - sql

Question

Trying to find all shareholders who hold more than 0.5% of the shares in any single company
here is my query I believe i am close also the image attached has the schema
![Select Sh.Share_Holder_Id Shareholderid,
Sh.First_Name||' '||Sh.Last_Name Shareholders,
c.name,
sum(T.Share_Amount) ShareAmount
From Trades T
Inner Join
Share_Holders Sh
On
T.Share_Holder_Id =Sh.Share_Holder_Id
Inner Join
Shares S
On
S.Share_Id =T.Share_Id
Inner Join
Companies C
on
C.Company_Id=S.Company_Id
Where exists (
Select
sum(case when shs.amount IS NULL THEN 1 ELSE 0 END)/count (*)*100
From Shares S1
Inner Join Share_Holder_Shares shs
On
Shs.Share_Id=S1.Share_Id
-- where Shs.Amount/t.share_amount * 100 > 0.5
)
Group By Sh.Share_Holder_Id,Sh.First_Name||' '||Sh.Last_Name,C.Name
order by Shareholderid;

Answer 1

Give this solution a try; it uses RATIO_TO_REPORT.
SELECT y.share_holder_id
, y.shareholders
, y.portion_of_co
, y.company_name
FROM (SELECT x.share_holder_id
, x.shareholders
, RATIO_TO_REPORT(x.share_amount)
OVER (PARTITION BY x.company_id) portion_of_co
, c.name company_name
FROM (SELECT sh.share_holder_id
, sh.first_name
|| ' '
|| sh.last_name shareholders
, s.company_id
, SUM(t.share_amount) share_amount
FROM trades t
INNER JOIN share_holders sh
ON t.share_holder_id = sh.share_holder_id
INNER JOIN shares s
ON s.share_id = t.share_id
GROUP BY sh.share_holder_id
, sh.first_name
|| ' '
|| sh.last_name
, s.company_id
) x
INNER JOIN companies c
ON x.company_id = c.company_id
) y
WHERE y.portion_of_co > 0.005
ORDER BY y.share_holder_id
;