I am trying to set a WHERE filter where only results with dates after last week Sunday (including last week Sunday) are returned. What I have at the moment is:
date_part(w,GETDATE())
This gives me the current week number. How do I know find the first date of this week number (43) so the 18th of October?
Hmmm . . . This returns weeks starting on Mondays, which is pretty standard:
date_trunc('week', current_date)
If you want Sunday to start the week, then:
date_trunc('week', current_date + interval '1 day') - interval '1 day'
Note: If today is Sunday, then it returns today's date. If you want last Sunday's date in that case, just use:
date_trunc('week', current_date) - interval '1 day'
Related
I need to return the dates between the 05 of the last month and the 05 of the current month Example today is the 16/08/2022 I recuperate therefore the whole of the days between the 05/07/2022 and the 05/08/2022
For the moment I try with this query
SELECT DATE from Db_name where date between date_trunc('month', current_date-1) and date_trunc('month',current_date)
Your initial query is very much on track. Just a couple additional things about dates:
current_date-1 subtracts 1 day, you need to subtract 1 month. Thus current_date - interval '1 month'.
date_trunc(somedate) returns the 1st of the month so
date_trunc('2022-08-17') returns 2022-08-01.
getting to the 5th of the month from the 1st just add interval '4 days'.
adding or subtracting intervals to dates results in timestamps.
Since you want dates so needs to be cast back to date.
select *
from db_name
where some_date between (date_trunc('month', current_date-interval '1 month') + interval '4 days')::date
and (date_trunc('month', current_date) + interval '4 days')::date;
But I will repeat do not any reserved word or data type as a name. At best is causes confusion, at worst it will run but do the wrong thing.
I'm trying to extract the week number from a date, and I want the week to be counted from Sunday to Saturday. This is what I currently have, but I can't seem to find any solution for this is SQL Presto.
SELECT WEEK(date) AS weeknum
Can this be solved?
Thank you!
One method is:
select week(date + interval '1 day') - interval '1 day'
Note: This may not work on the last day of the year.
Alternatively you can use the MySQL-like functions:
select date_format(date, '%V')
This has the week starting on Sunday.
I used postgresql to solve the quesion, query to return the day of the week of the first day of the month two years from today. I was able to solve it with the query below, but I am not sure my query is correct, I just wanna make sure
select cast(date_trunc('month', current_date + interval '2 years') as date)
You are correctly computing the first day of the month two years later with:
date_trunc('month', current_date + interval '2 years')
If you want the corresponding day of the week, you can use extract();
extract(dow from date_trunc('month', current_date + interval '2 years'))
This gives you an integer value between 0 (Sunday) and 6 (Saturday)
I am trying to query Firebird to get data from last month, from day 1 until last day (30 or 31 depending on the month). When I use the code below it gives me shifted dates from current, for example day 11/14/2017 until 12/13/2017.
The code:
WHERE DATE >= DATEADD(MONTH,-1, CURRENT_TIMESTAMP(2)) AND DATE<= 'TODAY'
The desired output is 11/01/2017 - 11/30/2017
What is the correct way to do it?
I don't use Firebird but I've used PostgreSQL fairly extensively and I think this should work:
WHERE
DATE BETWEEN dateadd(month, -1, CURRENT_DATE - EXTRACT(DAY FROM CURRENT_DATE) + 1)
AND CURRENT_DATE - EXTRACT(DAY FROM CURRENT_DATE)
Explanation
CURRENT_DATE - EXTRACT(DAY FROM CURRENT_DATE) + 1 should go back to the first of this month and dateadd with -1 month should take it to the previous month. Then if you're between CURRENT_DATE - EXTRACT(DAY FROM CURRENT_DATE) or in other words 12/13/2017 - 13 days that should be the last day of November. Crossing my fingers. Good luck.
How would I count the days from a date till the first of the following month
Example:
--Start Date
07-07-2011
How many days till:
-- The 1st of the succeeding month of the start date above
08-01-2011
Expected Result (in days):
25
So if I counted the day I get 25, so running this query gets me the desired timestamp:
SELECT CURRENT_DATE + INTERVAL '25 DAYS'
Results:
2011-08-01 00:00:00
just can't think of a way to get the number of days, any suggestions?
Or start date, end date, number of days between?
I don't have a PostgreSQL server handy, so this is untested, but I would try:
SELECT (DATE_TRUNC('month', CURRENT_DATE) + INTERVAL '1 MONTH') - CURRENT_DATE