Insert into table two and update table two for BigQuery in one query - insert

Question

I am using StandardSQL in BigQuery. I am writing a scheduled query which inserts records into table (2). Now, given that it's sceduled, I am trying to figure out how to update records in table (2) from the sceduled query, which is always inserting records into table (2).
In particular, when there is a record in table (2) but not generated by my query then I want to update table (2) and a boolean column to No.
Below is my query, where in the query would I add the update logic for table (2)?
INSERT INTO record (airport_name, icao_address, arrival, flight_number, origin_airport_icao, destination_airport_icao)
WITH
planes_stopped_in_airport AS (
SELECT
p.IATA_airport_code,
p.airport_name,
p.airport_ISO_country_code,
p.ICAO_airport_code,
timestamp,
a.icao_address,
a.latitude,
a.longitude,
a.altitude_baro,
a.speed,
heading,
callsign,
source,
a.collection_type,
vertical_rate,
squawk_code,
icao_actype,
flight_number,
origin_airport_icao,
destination_airport_icao,
scheduled_departure_time_utc,
scheduled_arrival_time_utc,
estimated_arrival_time_utc,
tail_number,
ingestion_time
FROM
`updates` a
JOIN
Polygons p
ON
1 = 1
WHERE
a.timestamp >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 20 MINUTE) and a.timestamp <= CURRENT_TIMESTAMP()
AND ( latitude IS NULL
AND longitude IS NULL
AND callsign IS NULL
AND speed IS NULL
AND heading IS NULL
AND altitude_baro IS NULL) IS FALSE
AND ST_DWithin( ST_GeogFromText( polygon ),
ST_GeogPoint(a.longitude,
a.latitude),
10)
AND a.collection_type = '1' -- and speed < 50
AND (origin_airport_icao IS NULL
AND destination_airport_icao IS NULL) IS FALSE )
SELECT
p.airport_name,
icao_address,
MIN(timestamp) AS Arrival,
flight_number,
origin_airport_icao,
destination_airport_icao
FROM
planes_stopped_in_airport p
WHERE
flight_number NOT IN (SELECT Distinct flight_number
FROM `table(2)`
)
GROUP BY
icao_address,
p.airport_name,
flight_number,
origin_airport_icao,
destination_airport_icao
HAVING
flight_number IS NOT NULL
ORDER BY
airport_name,
arrival

Answer 1

You can probably do it with MERGE statement, see details in https://cloud.google.com/bigquery/docs/reference/standard-sql/dml-syntax#merge_statement.
If I understood your requirements correctly, you need something like
MERGE dataset.Destination T
USING (SELECT * ...) S
ON T.key = S.key
WHEN MATCHED THEN
UPDATE SET T.foo = S.foo, T.bool_flag = FALSE
WHEN NOT MATCHED THEN
INSERT ...