BigQuery: convert epoch to TIMESTAMP

Question

I\'m trying to range-join two tables, like so

SELECT *
FROM main_table h
INNER JOIN
    test.delay_pairs d
ON
    d.interval_start_time_utc < h.visitStartTime         


        

Answer 1

You can use timestamp conversion functions like TIMESTAMP_SECONDS, TIMESTAMP_MILLIS, TIMESTAMP_MICROS

for example, assuming your h.visitStartTime is microseconds since the unix epoch

SELECT *
FROM main_table h
INNER JOIN test.delay_pairs d
ON d.interval_start_time_utc < TIMESTAMP_MICROS(h.visitStartTime)
AND TIMESTAMP_MICROS(h.visitStartTime) < d.interval_end_time_utc