How to add time column to the time stamp column in Vertica ? (or another db’s)

I have two columns like that:

ihour (type=HH:mm:ss) 06:40:41

its (type=timestamp) 2020-12-10 00:00:00.000000

I want to add ihour to the its column and have a single column showing me date and time. How can I do this in Vertica? If you know how to do it in another db’s, I would be happy because at least I could learn the way that I should follow in Vertica.

Answer

Cast the time to INTERVAL, and add the two:

WITH
indata(ihour,its) AS (
  SELECT TIME '06:40:41', TIMESTAMP '2020-12-10 00:00:00.000000'
)
SELECT
  its + ihour::INTERVAL(6) AS timesum
FROM indata;
timesum
2020-12-10 06:40:41