How to retrieve the last day of the month data - postgresql

Question

I have this SQL statement to retrieve ONLY the last day of stock quotes. But I am missing the data if the data falls on a non-end of month data.
This is my SQL.
select symbol, trade_date, close_price from soa_pse_stock_quotes_history where symbol = '2GO'
group by symbol, trade_date, close_price
having max(trade_date::date) = (date_trunc('month', trade_date::date) + interval '1 month - 1 day')::date
order by trade_date desc limit 100 ;
I am missing quotes for July and Apr because Jul data is July 29, the last business day of the month. The same for April.
What is the correct SQL to fetch the last quote for each end of the month?
Result:
2GO 2022-08-31 00:00:00 7.28
2GO 2022-06-30 00:00:00 6.82
2GO 2022-05-31 00:00:00 7.1
2GO 2022-03-31 00:00:00 7.31
2GO 2022-02-28 00:00:00 7.5
2GO 2021-12-31 00:00:00 7.61
2GO 2021-09-30 00:00:00 8.14
2GO 2021-08-31 00:00:00 8.06
2GO 2021-06-30 00:00:00 8.48
2GO 2021-05-31 00:00:00 8.34
2GO 2021-04-30 00:00:00 8.4
2GO 2021-03-31 00:00:00 8.5
2GO 2020-09-30 00:00:00 8.42
2GO 2020-06-30 00:00:00 9.63

Answer 1

Create a subquery that finds the max date for a symbol by month using GROUP BY symbol, date_trunc('month', trade_date)). Then join this to the table to get the closing price.
CREATE TABLE stock_table (
symbol varchar,
close_price numeric,
trade_date date
);
INSERT INTO stock_table
VALUES ('2GO', 7.0, '02/26/2022'),
('2GO', 7.1, '02/28/2022'),
('2GO', 7.4, '03/31/2022'),
('2GO', 7.2, '04/28/2022'),
('2GO', 7.3, '04/29/2022');
SELECT
st.symbol,
st.trade_date,
st.close_price
FROM
stock_table AS st
JOIN (
SELECT
symbol,
max(trade_date) AS max_date
FROM
stock_table
WHERE
symbol = '2GO'
GROUP BY
symbol,
date_trunc('month', trade_date)) AS m_date
ON st.symbol = m_date.symbol
AND st.trade_date = m_date.max_date;
symbol | trade_date | close_price
--------+------------+-------------
2GO | 02/28/2022 | 7.1
2GO | 03/31/2022 | 7.4
2GO | 04/29/2022 | 7.3