问题
I have a time-series starting from 2017-01-01 00:00:00 to the end of 2017-12-31 23:00:00 for 1-hour interval. I need to duplicate this 1-year timestamp for 2400 times in the same column. I need help about this one..
Row Date_time
1 2017-01-01 00:00:00 UTC
2 2017-01-01 01:00:00 UTC
3 2017-01-01 02:00:00 UTC
4 2017-01-01 03:00:00 UTC
5 2017-01-01 04:00:00 UTC
6 2017-01-01 05:00:00 UTC
7 2017-01-01 06:00:00 UTC
8 2017-01-01 07:00:00 UTC
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回答1:
You would do this in BigQuery by generating a timestamp array and then unnesting:
select ts
from unnest(generate_timestamp_array('2017-01-01 00:00:00', '2017-12-31 23:00:00', interval 1 hour)) ts
You can then get multiple rows with a similar construct:
select ts
from unnest(generate_timestamp_array('2017-01-01 00:00:00', '2017-12-31 23:00:00', interval 1 hour)
) ts cross join
unnest(generate_series(1, 2400)) n
来源：https://stackoverflow.com/questions/59305598/multiplying-a-timestamp-data-for-several-times-in-bigquery