When ever enter the date start date up to next year same date between the days divided into 8 parts

Question

when ever  enter the date start date up to next year same date between the days divided into 8 parts
Q1.1 (YYYY) = 1st half of Quarter 1 for year YYYY
Q1.2 (YYYY) = 2nd half of Quarter1 for year YYYY
Q2.1 (YYYY) = 1st half of Quarter 2 for year YYYY
Q2.2 (YYYY) = 2nd half of Quarter 2 for year YYYY
Q3.1 (YYYY) = 1st half of Quarter 3 for year YYYY
Q3.2 (YYYY) = 2nd half of QuarterQ3 for year YYYY
Q4.1 (YYYY) = 1st half of Quarter 4 for year YYYY
Q4.2 (YYYY) = 2nd half of Quarter 4 for year YYYY
Here YYYY depicts the year.
e.g. Q1.2 (2014) depicts the 2nd half of Quarter 1 for year 2014.
The description of these values are explained below.
The table below provides the description about each value:
Quarter     Quarter Range      Start Date
Q1.1      1 Jan - 15 Feb         1st  Jan
Q1.2      16 Feb-31 Mar         16th Feb
Q2.1      1 Apr- 15 May          1st Apr
Q2.2      16 May-30 June       16th May
Q3.1      1 Jul-15 Aug             1th Jul
Q3.2      16 Aug -30 Sep       16th Aug
Q4.1      1 Oct -15 Nov           1st Oct
Q4.2      16 Nov – 31 Dec      16th Nov
The dropdown values in time window needs to be updated as per date entered by the user in the Audit Plan start date and
should display the next four Quarter (each divided in 2 half  i.e. Eight values ) along with the year  from the selected Audit plan start date.
for eg. If the Plan start date is given as August 10 2013 then the Time window will display the following options:                      
Q3.2 (2013)                
Q 4.1 (2013)               
Q 4.2 (2013)               
Q 1.1 (2014)               
Q1.2 (2014)                
Q2.1 (2014)                
Q 2.2 (2014)               
Q 3.1 (2014)               
You can refer to the Table above and look that 10 Aug 2013 falls under the Q3.1 so Time window will display the next next 8 half Quarters ( Total 4 Quarter) till Q 3.1 for the year 2014.

Answer 1

Hello,
WITH half_quarters AS(
    SELECT  ADD_MONTHS(TRUNC(DATE '2013-08-15','Q'), 3*(LEVEL - 1)) hq_start
           ,1 part
    FROM    dual
    CONNECT BY ROWNUM <= 5
    UNION ALL
    SELECT  ADD_MONTHS(TRUNC(DATE '2013-08-15','Q'), 3*(LEVEL - 1) + 1) + 15 hq_start
           ,2 part
    FROM    dual
    CONNECT BY ROWNUM <= 5
,ordered_half_quarters AS(
    SELECT  hq_start
           ,part
           ,ROW_NUMBER() OVER (ORDER BY hq_start) r
    FROM    half_quarters
    WHERE   hq_start > DATE '2013-08-15'
SELECT  'Q '||TO_CHAR(hq_start,'Q')||'.'||part||' ('||TO_CHAR(hq_start,'YYYY')||')' q
FROM    ordered_half_quarters
WHERE   r <= 8
ORDER BY r;
Q       
Q 3.2 (2013) 
Q 4.1 (2013) 
Q 4.2 (2013) 
Q 1.1 (2014) 
Q 1.2 (2014) 
Q 2.1 (2014) 
Q 2.2 (2014) 
Q 3.1 (2014) 
half_quarters generates the start dates of every half of a quarter, starting with the begin of the first quarter that contains the sample date.
The next step is to order the dates and to select only those after the sample date.
The last part formats the output and orders the data.
Regards
Marcus