Number of days, weeks,months,years,quarters since 2000 - sql

Question

I need to populate a calendar table in a Oracle 11g database with the following:
calendar_date,
week_number,
week_year,
day_since_2000,
week_since_2000,
month_since_2000,
quarter_since_2000,
week_of_month
The table is already populated with data since 2000 I now need to populate it going back to 1994 with negative numbers for the since_2000 columns. I think I have everything figured but for week since 2000 and quarter since 2000.
EDIT1: Just noticed my week since 200 and month since 2000 is still messed up. Quarter since 2000 looks good after using the answer mentioned below. I am updating the query with the latest.
EDIT2: It was not working because of the missing trunc(). Its working fine now. Latest query updated.
This is what I am using to do that:
/* Formatted on 2/1/2013 11:54:27 AM (QP5 v5.227.12220.39724) */
CREATE OR REPLACE PROCEDURE populate_d_calendar (start_date IN DATE,
end_date IN DATE)
AS
BEGIN
INSERT INTO d_calendar (calendar_date,
week_number,
week_year,
day_since_2000,
week_since_2000,
month_since_2000,
quarter_since_2000,
week_of_month)
SELECT dt, --Date
TO_CHAR (dt,
'ww'), --Week in the year
TO_CHAR (dt,
'yyyy'), --Year
TO_CHAR (dt - end_date), --Day Since 2000
TRUNC (TO_CHAR (dt - end_date) / 7), --Week Since 2000
TRUNC (MONTHS_BETWEEN (dt,
end_date)), --Month Since 2000
CASE
WHEN TO_CHAR (dt,
'MMDD') >= '0101'
AND TO_CHAR (dt,
'MMDD') < '0401'
THEN
0
+ 4
* TRUNC ( MONTHS_BETWEEN (TO_DATE ( '0101'
|| TO_CHAR (dt,
'yyyy'),
'mmddyyyy'),
TO_DATE ('01Jun2000'))
/ 12) --q1
WHEN TO_CHAR (dt,
'MMDD') >= '0401'
AND TO_CHAR (dt,
'MMDD') < '0701'
THEN
1
+ 4
* TRUNC ( MONTHS_BETWEEN (TO_DATE ( '0101'
|| TO_CHAR (dt,
'yyyy'),
'mmddyyyy'),
TO_DATE ('01Jun2000'))
/ 12) --q2
WHEN TO_CHAR (dt,
'MMDD') >= '0701'
AND TO_CHAR (dt,
'MMDD') < '1001'
THEN
2
+ 4
* TRUNC ( MONTHS_BETWEEN (TO_DATE ( '0101'
|| TO_CHAR (dt,
'yyyy'),
'mmddyyyy'),
TO_DATE ('01Jun2000'))
/ 12) --q3
WHEN TO_CHAR (dt,
'MMDD') >= '1001'
AND TO_CHAR (dt,
'MMDD') <= '1231'
THEN
3
+ 4
* TRUNC ( MONTHS_BETWEEN (TO_DATE ( '0101'
|| TO_CHAR (dt,
'yyyy'),
'mmddyyyy'),
TO_DATE ('01Jun2000'))
/ 12) --q4
END
quarters_since_2000, --Quarter Since 2000
TO_CHAR (dt,
'w') --Week of the month
FROM (SELECT start_date + LEVEL - 1 dt
FROM DUAL
CONNECT BY LEVEL <= end_date - start_date + 1);
END;
/

Answer 1

i think you're after a floating point like with the others so maybe:
TO_CHAR (dt - end_date)/7 week_since_2000
and
(MONTHS_BETWEEN (dt,
end_date)/3) quarter_since_2000

Answer 2

with weeks you can follow one of the methods here:
http://searchoracle.techtarget.com/answer/Calculating-weeks-between-two-dates
because it will depend on which rules are more useful to you
with quarters, use this:
case
WHEN TO_CHAR (dt,'MMDD') >= '0101' and TO_CHAR (dt,'MMDD') < '0401' then 0 + 4 * trunc(months_between( to_date('0101' || to_char(dt,'yyyy'),'mmddyyyy'),to_date('01Jun2000' )) /12) --q1
WHEN TO_CHAR (dt,'MMDD') >= '0401' and TO_CHAR (dt,'MMDD') < '0701' then 1 + 4 * trunc(months_between( to_date('0101' || to_char(dt,'yyyy'),'mmddyyyy'),to_date('01Jun2000' )) /12) --q2
WHEN TO_CHAR (dt,'MMDD') >= '0701' and TO_CHAR (dt,'MMDD') < '1001' then 2 + 4 * trunc(months_between( to_date('0101' || to_char(dt,'yyyy'),'mmddyyyy'),to_date('01Jun2000' )) /12) --q3
WHEN TO_CHAR (dt,'MMDD') >= '1001' and TO_CHAR (dt,'MMDD') <= '1231' then 3 + 4 * trunc(months_between( to_date('0101' || to_char(dt,'yyyy'),'mmddyyyy'),to_date('01Jun2000' )) /12) --q4
end quarters_since_2000,

Answer 3

This is my version of calendar table from 1/1/2013 till today. I'm not sure how do you need to insert number of months, quarters, days etc... You need to display total number of months between every year or once? You can add those calc yourself or add desired output in your post to make it clear. See addl queries/comments below:
-- Days,weeks, quarters from 1/1/2013 --
SELECT start_date -- 1/1/2013 --
, TRUNC(start_date, 'iw') wk_starts
, TRUNC(start_date, 'iw') + 7 - 1/86400 wk_ends
, TO_NUMBER (TO_CHAR (start_date, 'IW')) ISO_wk#
, TO_NUMBER (TO_CHAR (start_date, 'Q')) Quarters
FROM
(
SELECT TRUNC(SYSDATE, 'Y')-1 + LEVEL AS start_date
FROM dual
CONNECT BY LEVEL <=
( -- replace this part to go back to 1994 - see below --
SELECT TRUNC(ADD_MONTHS (SYSDATE, 12), 'Y')-TRUNC(SYSDATE, 'Y') "Num of Days in 2013"
FROM dual
)
)
/
START_DATE WK_STARTS WK_ENDS ISO_WK# QUARTERS
---------------------------------------------------------------------
1/1/2013 12/31/2012 1/6/2013 11:59:59 PM 1 1
1/2/2013 12/31/2012 1/6/2013 11:59:59 PM 1 1
......
2/19/2013 2/18/2013 2/24/2013 11:59:59 PM 8 1
2/20/2013 2/18/2013 2/24/2013 11:59:59 PM 8 1
......
3/10/2013 3/4/2013 3/10/2013 11:59:59 PM 10 1
3/11/2013 3/11/2013 3/17/2013 11:59:59 PM 11 1
.......
-- 6971 days from 1/1/1994 till today - 2/1/2013 --
SELECT TRUNC(SYSDATE) - TRUNC(ADD_MONTHS (SYSDATE, -12*19), 'Y') "Num of Days from 1994"
FROM dual
/
-- 4780 days from 1/1/2000 till today - 2/1/2013 --
SELECT TRUNC(SYSDATE) - TRUNC(ADD_MONTHS (SYSDATE, -12*13), 'Y') "Num of Days from 2000"
FROM dual
/
-- 156 Months between from 2000 toll today --
SELECT MONTHS_BETWEEN(TRUNC(SYSDATE), TRUNC(ADD_MONTHS (SYSDATE, -12*13))) mo_btw_2000_till_today
FROM dual
/
-- Number of weeks btw. 2 dates --
SELECT to_char(sysdate, 'WW') - to_char(sysdate-30, 'WW') number_of_weeks FROM dual
/
This may not be exactly what you want... To help you more I need to see the actual expected output of your query. Just trying to help...