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https://stackoverflow.com/questions/24365544/subtract-an-interval-from-a-time-value
If you really only want the time, use current_time current_timestamp or now() will return a date as well. select current_time - interval '1' hour or to subtract one hour and 25 minutes: select current_time - interval '1:25' (note that you need to remove the hour keyword if you use an interval with hours and minutes)
https://stackoverflow.com/questions/32323426/postgresql-get-items-from-last-12-hours
I need to get items that have date_time1column for last 12 hours. SELECT p.*, t.*. FROM posts AS p LEFT JOIN posted_tweets AS t ON p.a_id = t.p_idWHERE p.date_time1 >= now() AND t.date_time =( SELECT MAX(date_time) FROM posted_tweets AS t2 WHERE t2.p_id = t.p_id) OR t.date_time IS NULL.
https://www.tutorialspoint.com/postgresql/postgresql_date_time.htm
It returns the start time of the current statement. 3: clock_timestamp() It returns the actual current time, and therefore its value changes even within a single SQL command. 4: timeofday() It returns the actual current time, but as a formatted text string rather than a timestamp with time zone value. 5: now()
https://www.postgresql.org/docs/9.1/functions-datetime.html
SELECT EXTRACT(EPOCH FROM TIMESTAMP WITH TIME ZONE '2001-02-16 20:38:40.12-08'); Result: 982384720.12 SELECT EXTRACT(EPOCH FROM INTERVAL '5 days 3 hours'); Result: 442800. Here is how you can convert an epoch value back to a time stamp: SELECT TIMESTAMP WITH TIME ZONE 'epoch' + 982384720.12 * INTERVAL '1 second';
https://learnsql.com/cookbook/how-to-get-the-current-time-without-time-zone-in-postgresql/
The PostgreSQL function LOCALTIME returns the current time on the machine running PostgreSQL. It returns it as a time data type in the ' hh:mm:ss.nnnnnn ' format. In this format: hh is a 2-digit hour. mm is a 2-digit minute. ss is a 2-digit second. nnnnnn are fractional seconds (from zero to 6-digit precision).
https://www.postgresqltutorial.com/postgresql-now/
Code language: SQL (Structured Query Language) (sql) In this example, we called the NOW() function within a transaction and as you can see its return values do not change through the transaction.. Note that the pg_sleep() function pauses the current session’s process sleep a specified of seconds.. If you want to get the current date and time that does advance during …
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