I know this error has been produced many time and a lot of answers came by but I believe every situation might be unique.
So i am trying to get a deficit value(imports - exports) from a table. Both values are on one column
value account
100 export
200 import
SO now i need to calculate the deficit or surplus, which is either import-export or export-import. I tried scalar subqueries but i am always getting this error.
SELECT label, product_type,status,((select value from Task2.quarterly_report where account="Imports") - (select value from Task2.quarterly_report where account="Exports")) As trade_deficit
so basically i am trying to get a table with:-
label product_type status trade_deficit
Can anyone explain to me the issue and why is it happening and how to solve it. Thanks in advance
You can use the conditional aggregation:
select sum(case when account = 'import' then value
when account = 'export' then - value
end)
from t;
This is based on the question and sample data. I don't see what your query has to do with the rest of the question.
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