Presto SQL / Athena：如何仅返回小时、分钟和秒，从“间隔天到秒”

Question

I have a query that from two timestamps calculates the difference and returns as a result a "interval day to second" like this:

SELECT (interval '1' second)*(timestamp_1 - timestamp_2) as time_delta

The result returned look like this:

  |  time_delta
--+----------------
  | 0 03:28:47.000
  | 0 02:20:37.000
  | 0 00:55:12.000

etc...

and the typeof() that result is "interval day to second".

Is there a way to keep only the hour-minute and second part? So that I would get something like:

  |  time_delta
--+----------------
  |   03:28:47
  |   02:20:37
  |   00:55:12

or, at the very least, remove the "day" part?

Thanks in advance.

Answer 1

Presto does not have functions to format interval values. Your options:

cast to varchar + regexp_replace :

presto:default> SELECT regexp_replace(CAST(parse_duration('3789s') AS varchar), '^0 (.*)\.000', '$1');
  _col0
----------
 01:03:09

or hour() , minute() and second() functions + concatenate. This is greatly simplified by the format() function, but that's not available on Athena yet.

Answer 2

You should be able to use the presto convienience function for the timestamp that you get back. It looks like presto supports the MySQL function format so you should be able to use date_parse based on the presto docs.

Something like

SELECT date_parse((interval '1' second)*(timestamp_1 - timestamp_2), %r) as time_delta

More info here: https://trino.io/docs/current/functions/datetime.html