How to select only specific hours from big table?

Question

I'm trying to select only specific hours from my table that contain "Datetime" and other variables.

Example 1 :

select distinct(Datetime) from NWP_OUT where HOUR(Datetime) = '00'; 

this works but when i try to select not only '00' no luck and no result

Example 2:

select distinct(Datetime) from NWP_OUT where HOUR(Datetime) = '00' and '06'; 

only show the first

I tried using 'between' but then i got 02,04,and 05

My end goal is to select only the data for hours: '00,03,06,09,12,18,21' it is 10 years of data so manual selection will be hard.

Thank you all in advance!

Answer 1

Use IN :

SELECT DISTINCT(datetime)
FROM NWP_OUT
WHERE HOUR(datetime) IN (0, 3, 6, 9, 12, 18, 21)

Answer 2

You want to use IN

SELECT
  DISTINCT(Datetime)
FROM
  NWP_OUT 
WHERE 
  HOUR(Datetime) IN ('00','03','06','09','12','18','21')