I have 12 monthly tables, one for each month of the year 2019, records are order by an identifier (mmsi) and datetime (timestamp). I have calculated the interval (linetime2) between two consecutive rows. see below (August 2019):
Now I need to convert interval in hours in a new column. How can I do it? Can I run this:
SELECT EXTRACT(epoch FROM linetime2)/3600
or I have to take into account the number of days in a month and year?
Related
I have a data set spanning 2 years and is updated daily, created a dashboard to give a view of incidents by date group. I have created a parameter using date trunc for Day/Week/Month/Quarter/Year. This is in Tableau.
I am trying to get the parameter to show a Week to date, Month to date and so on view. IE if on Weds 15th Dec I selected the weekly view, it would only show data for every week in the data set for Sat-Weds (My weeks go Sat-Fri) or the monthly view every month between 1st-15th
Ideally I am wanting this as a simple parameter for a drop down menu, I can do the week to date stuff as a rolling sum restarting every week in a separate table, but for ease I just need a date group function that will allow to do this.
Any suggestions would be appreciated.
Cheers
Pete
The solution is 5 parts:
Date Part Parameter
Max date [Max Date]
Dynamic date part of the Max date [Dynamic Date Part Max]
Dynamic date part of the historical dates [Dynamic Date Part]
Filter those date parts <= the Max date [Dynamic Date - Lass than Max]
Date Part Parameter
Max Date
This is the calculation you'd use with your dataset to find the max date.
{ MAX([Order Date]) }
In order to create a good example, I'm going to set my Max date to a specific date the falls in the middle of a week, in the middle of a month and middle of the year. I'm going use June 13th, 2018 as my Max Date.
So, if you want to follow along you can use the below date as your max date. You can also use this data set if you'd like.
DATE(#2018-06-13#)
Dynamic date part of the Max date
DATEPART([Select Date Part], [Max Date])
Dynamic date part of the Historical dates
DATEPART([Select Date Part], [Order Date])
Filter on Historical dates parts <= the Max Date
[Dynamic Date Part] <= [Dynamic Date Part Max]
Now that we have all the pieces we need let's check to make sure they are working as we would expect.
Looks like we're seeing all the days of the month that are <= the 13th.
When we change it to Day of the Week we see only the days of the week <= the 4th day of the week which is Wednesday when the week starts on Saturday.
Now let's calculate the running sum of sales along our dynamic date part to better help you with your example.
Drag the measure you want to calculate the running sum onto the label, then create a quick table calculation. We'll next need to edit this table calculation as so.
You'll then see your calculation working as you would expect.
Hope this was helpful. Happy vizzing!
I want to use Redshift to count the number of Mondays in a given time range. I've tried using date_part, which returns the day of the week. I can't use a simple count as there are multiple instances on the same day.
if you have dates table reference you can use the following code
select count(distinct my_table.date)
from my_table
where
date_part(dow,my_table.date)=1
and my_table.date between '2015-01-01' and '2016-01-01'
in this case the query will count all Mondays during 2015,
you can change the dates range the the day week .
date_part(dow,my_table.date)=1 -- Monday
date_part(dow,my_table.date)=2 -- Tuesday
and so on
if you don't have dates table , you should create Cartesian product
I have a condition here in which I will have total experience in terms of month and year. For example, two drop down will be there for asking total number of experience in month and year. So if I am working from 1 Jan 2012, then I will write total experience as 3 year and 11 months. Now I have to convert this 3 year and 11 months into date format so that I can save this into database
You could use java.util.Calendar:
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, month);
calendar.add(Calendar.YEAR, year);
Date date = calendar.getTime();
As a word of caution, the day field would be set to today's date. Check the intended behaviour if the current day is outside of the bounds for the target month. For example, setting the month to February when calendar has a day field of 30. It might be wise to set the day to a known, valid value for every month (eg: 1) before setting the month and year.
Use DATE_SUB() function:
Try this:
SELECT DATE_SUB(DATE_SUB(CURRENT_DATE(), INTERVAL 3 YEAR), INTERVAL 11 MONTH);
You can use mysql's date_sub() function or <date> - interval <expression> unit syntax to subtract an interval from a date.
select date_sub(curdate(),interval '3-11' YEAR_MONTH) as start_date
UPDATE:
Following the conversation between the OP and #eggyal, the OP need to replace the period in the incoming data with - and construct an insert statement as follows:
insert into mytable (...,join_date,...) values (...,date_sub(curdate(),interval '3-11' YEAR_MONTH),...)
I separated the time stamp to year and quarter and week using this query
select EVENTTIMESTAMP, Year (EVENTTIMESTAMP), QUARTER (EVENTTIMESTAMP), Week (EVENTTIMESTAMP) from KAP.COGNOS
there only two things i was trying to enhance in it
1- the weeks returns a number between 1-54, I want it to be return 13 or 14 weeks as weeks of Quarters.
2- to add word before the number of Quarter 'Quarter' and then it's number, and so to the weeks to show word 'Week' then the number
Many Thanks!!
I have tried the following:
add_months(to_Date('04/01/ind.birth_dte','MM/DD/YYYY'), 864) >= to_date('&StartDt','MM/DD/YYYY')
Is there a better way to pull April first of the participant's 72nd birth date?
You could use an interval calculation instead, but not sure how you're defining 'better'. Assuming you do want April 1st of the year in which their 72 birthday falls:
trunc(ind.birth_dte, 'YYYY') + interval '72-3' year to month
The trunc() function goes to the first day of their birth year, and the interval adds 72 years and 3 months to that, which will be April 1st.
SQL Fiddle with some sample dates, including a leap day to show that isn't a problem.
Or to compare that adjusted date with a fixed date as a filter:
where trunc(ind.birth_dte, 'YYYY') + interval '72-3' year to month
> to_date('&StartDt','MM/DD/YYYY');
SQL Fiddle.
You can use the trunc() method with your version as well to save building up a string and calling to_date, adding an additional three months to the add_months call (though I'd suggest you at least need a comment indicating where '867' comes from):
where add_months(trunc(ind.birth_dte, 'YYYY'), 867)
> to_date('&StartDt','MM/DD/YYYY');