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问题:
I have a query of the form:
select * from X where <some_date is in the last quarter>
I'm really having trouble with getting the correct dates for the last quarter. So, say current date is 1st of July, i.e. in the third quarter, I'd like to get the 1st of April as FIRST and the 30th of June as the LAST day of the last quarter (i.e the second quarter).
Googled a bit and found tons of solutions on this, but each and every one of them covered SQL Server and the funky methods which are available there are not available on our ORACLE database (Oracle 10g and 11g).
Oh yeah, and also I need to be able to put the whole thing into one query, as that is a restriction put upon me by some tool that will further work with this query... :/
回答1:
This one is simpler, but may still be not the simplest way:
SELECT ADD_MONTHS(TRUNC(SYSDATE, 'Q'), -3) AS First, TRUNC(SYSDATE, 'Q') - 1 AS Last FROM DUAL
Maybe you could also use a subselect, like this, to exclude some repetition of code:
SELECT ADD_MONTHS(D, -3) AS First, D - 1 AS Last FROM (SELECT TRUNC(SYSDATE, 'Q') AS D FROM DUAL)
回答2:
SELECT MIN (t), MAX (LAST_DAY (t)) FROM ( SELECT ADD_MONTHS (TRUNC (SYSDATE, 'yyyy'), LEVEL - 1) t, TO_CHAR (ADD_MONTHS (TRUNC (SYSDATE, 'yyyy'), LEVEL - 1), 'Q') r FROM DUAL CONNECT BY LEVEL <= 12) a WHERE a.r = 4;
回答3:
SELECT TRUNC(SYSDATE, 'Q')AS FIRST_DAY, last_day(add_months(TRUNC(SYSDATE, 'Q'),2)) as LAST_DAY FROM DUAL;
回答4:
This is one way to do it, it saves the bother of having to work out the first and last dates and put the results in a where clause for your main query:
select *, round(to_number(to_char(some_date, 'mm')) / 4) as quarter from x where round(to_number(to_char(some_date, 'mm')) / 4) = round(to_number(to_char(sysdate, 'mm')) / 4)
回答5:
Typical, as soon as I ask for help I find some blog which gives me the right idea how to proceed.
Managed to knock some statement together, however it is absolutetly but-f***ing ugly. :)
select TRUNC(ADD_MONTHS(sysdate, -3),'Q') as first, LAST_DAY(TRUNC(ADD_MONTHS(sysdate, -3),'Q')+ 85) as last from dual;
This does the trick as it seems, however if someone knows of a better solution, please let me know! (to_date('27-JAN-11') is in there as an example date...)
Edit: Fixed a bug - adding 3 months to the first day of a quarter does not always end up in the same quarter. Now its even uglier - damn you gregorian calendar!
回答6:
SELECT DATE_CURRENT , TRUNC (ADD_MONTHS (DATE_CURRENT, -6), 'Q') AS FIRST , LAST_DAY (TRUNC (ADD_MONTHS (DATE_CURRENT, -6), 'Q') + 85) AS LAST , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-1)) AS PREVIOUS_QUARTER_END , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-1)),-3)+1 AS PREVIOUS_QUARTER_START FROM ( SELECT TO_DATE ('31.07.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('30.06.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('30.04.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('31.03.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL ) order by DATUM;
回答7:
SELECT DATE_CURRENT , TRUNC (DATE_CURRENT, 'Q') AS Q1F , LAST_DAY (ADD_MONTHS(TRUNC (DATE_CURRENT, 'Q'),2)) AS Q1L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-1)) AS Q2F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-1)),-3)+1 AS Q2L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-4)) AS Q3F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-4)),-3)+1 AS Q3L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-7)) AS Q4F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-7)),-3)+1 AS Q4L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-10)) AS Q5F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-10)),-3)+1 AS Q5L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-13)) AS Q6F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-13)),-3)+1 AS Q6L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-16)) AS Q7F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-16)),-3)+1 AS Q7L , LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-19)) AS Q8F , ADD_MONTHS(LAST_DAY (ADD_MONTHS(trunc(DATE_CURRENT,'Q'),-19)),-3)+1 AS Q8L FROM ( SELECT TO_DATE ('05.03.2017', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('30.06.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('30.04.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL UNION SELECT TO_DATE ('31.03.2014', 'DD.MM.YYYY') AS DATE_CURRENT FROM DUAL )
