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I need to set the time of a timestamp in SQL. My results need to be between yesterday at 7 o'clock and today at 7 o'clock.

Here is the query

WHERE created_at BETWEEN 
    ?::timestamp - INTERVAL '1 day' AND ?::timestamp 
ORDER BY created_at DESC

The value is:

2017-05-30

I've seen the PostgreSQL datetime functions. But I don't know how to specify a time


Here is the query with static datetimes

SELECT 
    * 
FROM 
    "myTable" 
WHERE 
    created_at BETWEEN '2017-05-30 07:00:00' AND '2017-05-30 07:00:00'
ORDER BY 
    created_at DESC

Now I need to replace the datetime strings with a date string and add the time in SQL

  • created_at BETWEEN '2017-05-30 07:00:00' AND '2017-05-30 07:00:00' is effectively the same as created_at = '2017-05-30 07:00:00' did you mean BETWEEN '2017-05-29 07:00:00' AND '2017-05-30 07:00:00'? – a_horse_with_no_name May 30 '17 at 13:30
2

You can use current_date (without a time) and then add the 7 hours:

WHERE created_at BETWEEN (current_date - 1) + time '07:00:00' 
                     AND current_date + time '07:00:00' 

(current_date - 1) is "yesterday"

Alternatively you could use an interval:

WHERE created_at BETWEEN (current_date - 1) + interval '7' hour
                     AND current_date + interval '7' hour

I prefer adding a "time" as that is easier to write if you also want to include minutes, e.g. current_date + time '07:30:00'

  • Beware that this will give the wrong answer on the days when Daylight Saving Time begins and ends. – jjanes May 30 '17 at 19:06
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Since you didn't give any sample data, I based it on create date on databases.

select name, datediff(day, create_date, getdate()) DaysDiff from sys.databases
**where DATEDIFF(DAY, create_date,getdate()) > 1**

You'll need to evaluate days difference, something like:

where DATEDIFF(DAY, create_at, getdate()) > 1 
  • I added a sample how it looks with static strings – Phil795 May 30 '17 at 12:58
  • 1
    There is no datediff() in Postgres (or "SQL") – a_horse_with_no_name May 30 '17 at 13:29
  • OK, was confused by tags and OP wording. – Henrico Bekker May 30 '17 at 13:31

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