I want to be able to store for example 2:30pm in a column in SQLite, and be able to pull that time and convert it to seconds, does SQLite have a function for this?
I was reading http://www.sqlite.org/datatype3.html and they do state they have a time function, but can I do this? I know that SQLite does not have a time datatype, but what type should I store it as then, varchar?
2:30pm --> 52200
I was reading more into this: http://www.sqlite.org/lang_datefunc.html
and it seems like the list of time acceptable is :
YYYY-MM-DD
YYYY-MM-DD HH:MM
YYYY-MM-DD HH:MM:SS
YYYY-MM-DD HH:MM:SS.SSS
YYYY-MM-DDTHH:MM
YYYY-MM-DDTHH:MM:SS
YYYY-MM-DDTHH:MM:SS.SSS
HH:MM
HH:MM:SS
HH:MM:SS.SSS
now
DDDDDDDDDD
So does that mean you can't use 2:30pm as a format?
Since you will need the value to be in seconds from the beginning of the day (per your clarification) you can just store as an integer. To convert it to seconds from the beginning of the day rather than 1970 simply subtract midnight of the current day from it.
Something like this
strftime('%s','2004-01-01 14:30:00') - strftime('%s','2004-01-01 00:00:00')
If 2:30pm that you are trying to store is current time then you can shorten it to
strftime('%s','now') - strftime('%s','2004-01-01 00:00:00')
Related
My demand is really so silly, so basically I need to go back in time 24 hours in a timestamp column in Hive.
So far, I have tried two different ways but it's not going thru:
select
recordDate, --original date
cast(date_sub(cast(recorddate as timestamp),1) as timestamp), -- going one day behind without hour
cast((cast(cast(recorddate as timestamp) AS bigint)-1*3600) as timestamp) -- crazy year
from mtmbuckets.servpro_agents_events limit 10;
My output looks:
I appreciate the support you can give me.
thanks
There is not straight forward function in hive .
1 Create UDF to do so .
or
Convert date in no of second and do you calculation( -24 *60*60) sec then change back int to data.
use from_unixtime and unix_timestamp to achieve below code.
select from_unixtime(unix_timestamp(recorddate) - 86400)
from mtmbuckets.servpro_agen ts_events limit 10;;
From_unixtime
Convert time string with given pattern to Unix time stamp (in seconds) The result of this function is in seconds.
Unix_timestamp
Converts time string in format yyyy-MM-dd HH:mm:ss to Unix timestamp (in seconds), using the default timezone and the default locale, return 0 if fail: unix_timestamp('2009-03-20 11:30:01') = 1237573801
I'm trying to figure out the cleanest way to do a comparison in Teradata SQL Assistant. I have the scheduled start date (TimeStamp), the Schedule start time (varchar), actual start and end times (TimeStamp). I need to consolidate the scheduled start date and time and be able to compare it to the actual start and end date and time without modifying the original data (because it's not mine). I realize that the Scheduled Start Time [SST] is in a 24 hour time format with a AM/PM suffix, but like I said before, I can't change that.
I tried to do select cast(substr(scheduled_start_date,1,5) as TIMESTAMP(0)) from DB.TBL but am getting the "Invalid timestamp" error. There is example table data below.
Sch Start Date Sch Start Time Actual Start Actual End
09/11/2017 00:00:00 11:30 AM 09/11/2017 11:34:16 09/11/2017 11:58:00
05/26/2017 00:00:00 15:30 PM 05/26/2017 15:40:00 05/26/2017 15:55:15
11/06/2017 00:00:00 19:30 PM 11/06/2017 21:25:00 11/06/2017 21:45:00
Thanks!
You need to cast the schedule start time as an Interval, then you can easily add it to the start date:
scheduled_start_date
+ Cast(Substr(scheduled_start_time, 1,5) AS INTERVAL HOUR TO MINUTE)
A start date which is a timestamp seems to indicate this was ported from Oracle/SQL Server?
And a 24 hour time format with a AM/PM suffix is also quite strange.
A couple things to try:
Convert the separate Scheduled Date and Scheduled Time fields into strings, concatenate them, and feed that into a TIMESTAMP CAST. Something like:
SELECT
CAST(CAST(Scheduled_Date AS DATE) AS VARCHAR(25)) AS Date_String,
CAST(CAST(Scheduled_Time AS TIME FORMAT 'HH:MM BB') AS VARCHAR(25)) AS Time_String,
CAST(TRIM(Date_String) || ' ' || TRIM(Time_String) AS TIMESTAMP(0)) AS MyTimestamp
Cast the Scheduled Time field as a TIME data type. Cast the Scheduled Date field as a DATE data type. Then somehow combine the two into a TIMESTAMP field -- either with a CAST or some kind of timestamp constructor function (not sure if this is possible)
Option 1 should work for sure as long as you properly format the strings. Try to avoid using SUBSTRING and instead use FORMAT to cast as DATE/TIME fields. Not sure about Option 2. Take a look at these link for how to format DATE/TIME fields using the FORMAT clause:
https://www.info.teradata.com/HTMLPubs/DB_TTU_16_00/index.html#page/SQL_Reference%2FB035-1143-160K%2Fmuq1472241377538.html%23wwID0EPHKR
https://www.info.teradata.com/HTMLPubs/DB_TTU_16_00/index.html#page/SQL_Reference/B035-1143-160K/cmy1472241389785.html
Sorry, I don't have access to a TD system to test it out. Let me know if you have any luck.
I need to take a full timestamp column (Format: YYYY-MM-DD HH:MM:SS.SSSS) and convert it into hourly timestamp (Format: YYYY-MM-DD HH:00:00)
For example:
I want to convert my existing date:
2016-02-26 04:00:07.766304000
into:
2016-02-26 04:00:00
I tried to use unix_timestamp() and from_unixtime() function but it is too confusing :X
Does someone know how to easily do it?
Many Thanks for the helpers :)
You can use to_date() to get the date of the time and hour() to get the hour of the time, and then concat them together if you do not want to use unix_timestamp() or from_unixtime().
Suppose 'submit_time' looks like '2016-02-26 04:00:07.766304000'.
concat(to_date(submit_time),' ',cast(hour(submit_time) as string),':00:00')
will gives the answer.
I'm storing my dates in SQLite in a column of data type INTEGER. I'm storing the milliseconds since 1970.
Eg:
date (long) other columns ...
-----------------------------------------
1407297600000 ...
1407211200000 ...
1407124800000 ...
My question is: how can I use strftime() under this circumstances?
If not, I should use TEXT as the column type??
Running this:
select strftime('%Y-%m', date) from my_table;
Is throwing nonesense stuff:
strftime('%Y-%m', date)
-----------------------------------------
1968-19
1968-19
1968-19
Unless you tell it otherwise, strftime() thinks those numbers are Julian day values - very different from Unix epoch milliseconds.
You'll want to convert to seconds, and tell strftime() these are Unix epoch numbers:
select strftime('%Y-%m', date / 1000, 'unixepoch');
See the Modifiers section in the SQLite Date and Time Functions docs.
So I know I can use =FormatDate(MyDate ,"mm/dd/yy") to turn a date into a string. I am then trying to add on a time:
=FormatDate(AdminDate ,"mm/dd/yy") + MyTime
Which works, however, I need to format this back to a datetime field (as I need to compare against a preexisting datetime field). I try using Todate(), but the documentation is very light, and provides very little on what is acceptable in the formatting of the date area, and nothing in the way of time!
I have attempted:
=ToDate(FormatDate(MyDate ,"mm/dd/yy HH:mm:ss") + MyTime ,"mm/dd/yy HH:mm:ss")
but this will only work when there is no time (and it just nulls out the time) and any row with a time will return a #ERROR
Anyone have an insight on formatting datetimes?
Thanks
The correct way to use the FormatDate command to output date and time components together in 12 hour format is:
=FormatDate(AdminDate; "MM/dd/yy hh:mm:ss a")
and in 24 hour format is:
=FormatDate(AdminDate; "MM/dd/yy HH:mm:ss")
Note MM is used in months and mm in minutes.