SQL trigger function to UPDATE daily moving average upon INSERT

Question

I am trying to create a SQL trigger function which should UPDATE a column when data is INSERTed INTO the table. The update is based on the values present in the values being INS

Answer 1

Can't you just do something along those lines?

INSERT INTO daily_ohlc 
SELECT current_date, 101, 110, 95, 108, (COUNT(*)*AVG(close)+108)/(1+Count(*))
FROM daily_ohlc
WHERE cDate >= ANY (
    SELECT MIN(cdate)
    FROM (SELECT CDate, ROW_NUMBER() OVER (ORDER BY CDate DESC) as RowNum FROM daily_ohlc) a 
    WHERE RowNum <= 7
)

I know very well it could appear complicated compared to a trigger.
However, I am trying to avoid a case where you successfully create the ON INSERT trigger and next want to handle updates in the table. Updating a table within a procedure triggered by an update in the same table is not the best idea.