Postgresql query deletes all rows - postgresql

Question

I wrote a simple delete query in a PostgreSQL function with using clause, left join and a where clause. But the query does not take the where condition in consideration. It deletes all rows.
I wrote two types of query both produce same result
Query 1
delete from "StockInfos" using "StockInfos" as si
left outer join "PurchaseOrderInfos" as poi on poi."Id" = si."PurchaseOrderInfoId"
left outer join "ReceivingInfos" as ri on ri."PurchaseOrderInfoId" = poi."Id"
where ri."Id" = (delete_data->>'Id')::bigint;
Query 2
delete from "StockInfos" where exists (
select * from "StockInfos" as si
left join "PurchaseOrderInfos" as poi on poi."Id" = si."PurchaseOrderInfoId"
left outer join "ReceivingInfos" as ri on ri."PurchaseOrderInfoId" = poi."Id"
where ri."Id" = (delete_data->>'Id')::bigint
);
I don understand what is the problem. May anyone tell what is going wrong?

Answer 1

I would rephrase this with a correlated subquery. This makes the logic much cleaner, and should do what you want:
delete from "StockInfos" si
where exists (
select 1
from "PurchaseOrderInfos" poi
inner join "ReceivingInfos" as ri on ri."PurchaseOrderInfoId" = poi."Id"
where
oi."Id" = si."PurchaseOrderInfoId"
and ri."Id" = (si.delete_data->>'Id')::bigint
)