Hi i have to add 24 hours on a timestamp converted from a string in postgres db.
here my code:
select to_timestamp(timestamp_start, 'YYYY-MM-DD HH24:MI:SS.US') + interval '24 hour' as tstamp from tablename
the query works but it adds two 0 at the end of the timestamp: "2017-05-23 17:35:13.105867+00"
why and how to solve it?
+00 meant it is timestamp with timezone and your client timezone is UTC.
If you dont want those +00 on the screen, cast it to timestamp without timezone, eg:
t=# select now();
now
-------------------------------
2017-05-23 09:04:46.105322+00
(1 row)
Time: 0.690 ms
t=# select now()::timestamp;
now
----------------------------
2017-05-23 09:04:51.849522
(1 row)
Time: 0.537 ms
So for query in original post it would be:
select (to_timestamp(timestamp_start, 'YYYY-MM-DD HH24:MI:SS.US') + interval '24 hour')::timestamp as tstamp
from tablename
Related
When I use SELECT NOW(); I'll get an output like this:
now
-------------------------------
2019-09-09 18:55:38.794006-05
(1 row)
I want it like this:
now
-------------------
2019-09-09 18:55:38
(1 row)
How do I make NOW() round up/down accordingly? I tried SELECT NOW()::timestamptz(0); but it keeps adding -05 to the end of the time :(
You can to_char
select to_char(now(), 'YYYY-MM-DD HH:MI:SS')
or use date_truc to retain datatype timestamp with time zone
select date_trunc('minute', now());
Convert NOW() to a timestamp without timezone:
SELECT NOW()::timestamp(0)
I have a table full of "Julian Dates", that is the number of days and seconds away from 1/1/2035. I need to convert these to normal postgres timestamps. Can anyone help?
--Converts '2000-06-20 12:30:15' into an Epoch time base which gives a result of -12612.478993055556
select (EXTRACT(epoch FROM ('2000-06-20 12:30:15'::timestamp - '2035-01-01 00:00:00'))/86400.00) as run_ts
--Question, how to convert -12612.478993055556 back into '2000-06-20 12:30:15'
select -12612.478993055556 ??? as run_ts
You can use to_timestamp() to convert an epoch to a timestamp.
The epoch you posted does not correspond to 2000-06-20, as you have removed another date 2035-01-01 from it.
select (EXTRACT(epoch FROM ('2000-06-20 12:30:15'::timestamp )));
date_part
-----------
961504215
(1 row)
select to_timestamp(961504215);
to_timestamp
------------------------
2000-06-20 08:30:15-04
(1 row)
select to_timestamp(-12612.478993055556);
to_timestamp
-------------------------------
1969-12-31 15:29:47.521007-05
(1 row)
EDIT
Since you are not considering a true epoch but really a difference between two dates, you can simply add this difference to the reference date. You can use the day interval to remove the need to multiply by 86400 (seconds/day)
select '2035-01-01 00:00:00'::timestamp + interval '1' day * -12612.478993055556;
?column?
---------------------
2000-06-20 12:30:15
I have a table in my postgres database which has a column of dates. I want to search which of those dates is missing - for example:
date
2016-11-09 18:30:00
2016-11-09 19:00:00
2016-11-09 20:15:00
2016-11-09 22:20:00
2016-11-09 23:00:00
Here, |2016-11-09 21:00:00| is missing. After sorting my generated series if my table has an entry between two slots (slot of 1 hr interval) i need to remove that.
I want to make a query with generate_series that returns me the date which is missing. Is this possible?.
sample query that i used to generate series.
SELECT t
FROM generate_series(
TIMESTAMP WITH TIME ZONE '2016-11-09 18:00:00',
TIMESTAMP WITH TIME ZONE '2016-11-09 23:00:00',
INTERVAL '1 hour'
) t
EXCEPT
SELECT tscol
FROM mytable;
But this query is not removing 2016-11-09 18:30:00,2016-11-09 20:15:00 etc. cuz i used except.
This is not a gaps-and-island problem. You just want to find the 1 hour intervals for which no record exist in the table.
EXCEPT does not work here because it does equality comparison, while you want to check if a record exists or not within a range.
A typical solution for this is to use a left join antipattern:
select dt
from generate_series(
timestamp with time zone '2016-11-09 18:00:00',
timestamp with time zone '2016-11-09 23:00:00',
interval '1 hour'
) d(dt)
left join mytable t
on t.tscol >= dt and t.tscol < dt + interval '1 hour'
where t.tscol is null
You can also use not exists:
select dt
from generate_series(
timestamp with time zone '2016-11-09 18:00:00',
timestamp with time zone '2016-11-09 23:00:00',
interval '1 hour'
) d(dt)
where not exists (
select 1
from mytable t
where t.tscol >= dt and t.tscol < dt + interval '1 hour'
)
In this demo on DB Fiddle, both queries return:
| dt |
| :--------------------- |
| 2016-11-09 21:00:00+00 |
So I'm having this query:
SELECT
TO_CHAR(date_part('hour', created_at), 'YYYY-MM-DD HH24'),
to_char(created_at, 'day') ",
COUNT(*) AS "
FROM table
GROUP BY 1,2
ORDER BY 1 DESC
When I execute the query I get this:
ERROR: multiple decimal points
Searching stackoverflow I found some recommendations here:
How to format bigint field into a date in Postgresql? but I don't get why do I have to divide by 1000 and how this would apply in the case of the date_part function.
I assume created_at is a timestamp?.. I'm choosing from date_part(text, timestamp) and date_part(text, interval), if so date_part will return a double precision, to which you try to apply the mask 'YYYY-MM-DD HH24', eg:
v=# select date_part('hour', now());
date_part
-----------
9
and I don't see how you could possibly get year, month, day and hour from nine...
Yet I assume you wanted to apply the mask against truncated date to the hour precision, which is done with date_trunc(text, timestamp):
v=# select date_trunc('hour', now());
date_trunc
------------------------
2017-06-20 09:00:00+01
(1 row)
so now you can apply the time format:
v=# select to_char(date_trunc('hour', now()),'YYYY-MM-DD HH24');
to_char
---------------
2017-06-20 09
(1 row)
but if this is what you want, then you don't need to truncate time at all:
v=# select to_char(now(),'YYYY-MM-DD HH24');
to_char
---------------
2017-06-20 09
(1 row)
https://www.postgresql.org/docs/current/static/functions-datetime.html
I either need to add 5 hours or convert from GMT to EST. The return is currently showing everything from 7p and later yesterday...
WHERE
incident.initial_symptom = 'Chrome Upgrade' AND
DATE(incident.install_completed) = CURRENT_DATE;
Instead of manually adding interval to get wanted time zone, use at time zone, eg:
t=# select now(), now() at time zone 'est';
now | timezone
------------------------------+---------------------------
2017-04-07 07:07:39.17234+00 | 2017-04-07 02:07:39.17234
(1 row)
Depending on your timezone, exactly same statement adding interval to your date gives different result, eg at DST shift hour:
t=# set timezone TO 'WET';
SET
t=# select '2017-03-26 00:00:00'::timestamptz + '1 hour'::interval;
?column?
------------------------
2017-03-26 02:00:00+01
(1 row)
t=# set timezone TO 'EET';
SET
t=# select '2017-03-26 00:00:00'::timestamptz + '1 hour'::interval;
?column?
------------------------
2017-03-26 01:00:00+02
(1 row)