Comments on: Performing Math on Oracle Dates

By: Sanjay

Sanjay — Thu, 11 Aug 2011 10:41:52 +0000

I am using following query to get difference between dates without considering time.

select to_date(to_char(sysdate,’dd/mm/yy’),’dd/mm/yy’)- to_date(to_char(status_date,’dd/mm/yy’),’dd/mm/yy’), from status_table;

so that 11-Aug-2011 – 08-Aug-2011 is always 3.

Is there any better way to do that?

By: c powell

c powell — Sun, 10 Apr 2011 12:06:13 +0000

Hello,

thanks for the tips. but i want to get the number of years between sysdate and a given date. finding it difficult. the date is to be obtained from personal social number in the form yymmdd-xxxx

this query below is to get the days between then i will have to convert to years.

select upper(first_name) first_name,upper(last_name) last_name,
round((to_date(substr(pnr,1,6), ‘yymmdd’)- sysdate), 1)Age from car_owner;

I am having a problem with my results: e.g. 490321-7899, is giving me 13859.4 days but when i calculate manually it gives me about 22,665 days.

Need help to go about this.

By: Ramakrishna

Ramakrishna — Wed, 21 Apr 2010 23:05:06 +0000

Anyone Please help me in deriving the following

If i provide a date How can i derive the following using SQL scripts / SQL Queries.

1. How to get No of Weeks in a particular month.
2. How to get the Starting date’s of every week
(Irrespective of Monday/thursday …so on) for that month.
3. How to get the No of Business Days for every week.

Find the following example for reference/visualization purposes.

Ex: 5 Weeks (for the Month of June 2010)

No of Business
Days in a Week Date
————— ———–
Week 1 = 4 6/1/2010 (Tue)
Week 2 = 5 6/7/2010 (Mon)
Week 3 = 5 6/14/2010 (Mon)
Week 4 = 5 6/21/2010 (Mon)
Week 5 = 3 6/28/2010 (Mon)

We need the above format if we provide the date(06/01/2010 {01-Jun-2010} as a input.

By: vikram

vikram — Fri, 27 Jun 2008 11:02:07 +0000

i hav two dates start_date and end_date the dates should be compared with sys date and the previous month of sys date..considering leap year..plz any one can send me the quey for this…

By: Yasin

Yasin — Tue, 27 May 2008 12:54:41 +0000

I am looking oracle function where I have to compare two dates and result of comparision expressed in Month and Days.
Ex
months_between( To_Date(’16-05-2008′, ‘DD-MM-YYYY’ ), To_Date(’01-04-2008′, ‘DD-MM-YYYY’))

expected Result 1 month 13 days

Thanks in Advance

By: Chris

Chris — Thu, 27 Mar 2008 18:06:31 +0000

I needed a “where” clause that selected events that occurred in previous week (Sunday midnight to Saturday 23:59:59):

where event_date between sysdate - (to_number(to_char(sysdate,'D')) + 6) - ((to_number(to_char(sysdate,'SSSSS'))) / 86400) and sysdate - to_number(to_char(sysdate,'D')) - (((to_number(to_char(sysdate,'SSSSS'))) / 86400) - .99999)

By: paschima

paschima — Thu, 24 Jan 2008 12:35:06 +0000

i want to select the date just near by to the system date from a given data base .

Regards:
paschima

By: .

Fri, 28 Dec 2007 20:30:38 +0000

SELECT
( CASE
WHEN TO_CHAR(l_date, ‘D’) = 1 THEN l_date – 2
WHEN TO_CHAR(l_date, ‘D’) = 7 THEN l_date – 1
WHEN TO_CHAR(l_date, ‘D’) BETWEEN 2 and 6 THEN l_date END ) Last_Weekday
FROM ( SELECT LAST_DAY(l_date) l_date FROM ( SELECT l_date FROM ( SELECT TO_DATE(‘&YYYYMMDD’, ‘YYYYMMDD’) l_date FROM dual ) ) )
/

By: sudhakar

sudhakar — Mon, 10 Sep 2007 19:48:32 +0000

Just use the above query in post # 6 and change

With date_v as
(select last_day(to_date(’&MM-&DD-&yyyyy’,’MM-DD-YYYY’)) mydate from dual)
select max(date_v.mydate-(i-1)) last_weekday
from date_v,(select level i from dual connect by level between 1 and 7)
where to_char(date_v.mydate-(i-1),’Dy’) in (’Sat’,’Sun’))

By: Ajit Kumar Jha

Ajit Kumar Jha — Mon, 02 Jul 2007 07:17:35 +0000

I want to display the last sunday of the month. What would be query?