How can I do a loop within a select statement

Question

This is my query
Select distinct
s.First_NM,
s.Last_nm,
s.Date_of_birth,
i.Class_ID,
i.Enrollment_begn_dt,
i.Enrollment_end_dt,
SUBSTR(TO_CHAR(i.Enrollment_begn_dt, 'MMDDYYYY'),1,2) AS MONTH,
SUBSTR(TO_CHAR(i.Enrollment_end_dt, 'MMDDYYYY'),5,4) AS YEAR,
CASE WHEN TO_NUMBER(SUBSTR(TO_CHAR(i.Enrollment_begn_dt, 'MMDDYYYY'),1,2)) >= '5'
      THEN (TO_NUMBER(SUBSTR(TO_CHAR(i.Enrollment_begn_dt,'MMDDYYYY'),5,4)) + '1')
       ELSE TO_NUMBER(SUBSTR(TO_CHAR(i.Enrollment_begn_dt,'MMDDYYYY'),5,4)) END AS Enrollment_cycle
From student s, institution iEnrollment cycles are defined as follows
05/1/2004 to 04/30/2005 == 2005
05/1/2005 to 04/30/2006 == 2006
05/1/2006 to 04/30/2007 == 2007
05/1/2007 to 04/30/2008 == 2008
This is the current output
First_NM       Last_nm     Date_of_birth     Class_ID     Enrollment_begn_dt     Enrollment_end_dt     Enrollment_cycle
Jake     Brown     11/10/1999     Blue_007         7/10/2004        6/10/2007        2005
Amy     Burrell     5/1/1999                     Blue_007         1/20/2005        5/1/2005        2005
Char     Goblin     12/24/1999     Blue_007         3/3/2006        7/10/2020        2006My desired output is - which I am having difficulty creating
First_NM       Last_nm     Date_of_birth     Class_ID     Enrollment_begn_dt     Enrollment_end_dt     Enrollment_cycle
Jake     Brown     11/10/1999     Blue_007         7/10/2004        4/30/2005       2005
Jake     Brown     11/10/1999     Blue_007         5/1/2005        4/30/2006       2006
Jake     Brown     11/10/1999     Blue_007         5/1/2006        4/30/2007       2007
Jake     Brown     11/10/1999     Blue_007         5/1/2007        6/10/2007       2008
Amy     Burrell     5/1/1999                     Blue_007         1/20/2005        5/1/2005       2005
Char     Goblin     12/24/1999     Blue_007         3/3/2006        4/30/2006       2006
Char     Goblin     12/24/1999     Blue_007         5/1/2006        4/30/2007       2007
Char     Goblin     12/24/1999     Blue_007         5/1/2007        4/30/2008       2008
Char     Goblin     12/24/1999     Blue_007         5/1/2008        4/30/2009       2009I trying to break up each record in the previous table into multiple enrollment cycles based on how it is decribed.
Also note the last record - the cycle ends at 4/30/2009 ----This is because the enrollment_cycle will only stop at the current year + 1 (i.e if we assume current year to be 2008 then the cut off will be year will be 2009 hence I have 4/30/2009 instead of 7/10/2020
I am thinking this can be done with a for loop but I am not sure how to do it. without hard coding the dates.
Please help me!!!!!

Answer 1

Hi ,
I forgot the DATE_OF_BIRTH.
Regards
Salim.
WITH t AS
     (SELECT 'Jake' first_nm, 'Brown' last_nm, to_date('11/10/1999','mm/dd/yyyy') date_of_birth,
             'Blue_007' class_id, to_date('07/10/2004','mm/dd/yyyy') enrollment_begn_dt,
             to_date('06/10/2007','mm/dd/yyyy') enrollment_end_dt, '2005' enrollment_cycle
        FROM DUAL
      UNION ALL
      SELECT 'Amy', 'Burrell', to_date('05/01/1999','mm/dd/yyyy'), 'Blue_007', to_date('01/20/2005','mm/dd/yyyy'),
             to_date('05/01/2005','mm/dd/yyyy'), '2005' enrollment_cycle
        FROM DUAL
      UNION ALL
      SELECT 'Char', 'Goblin', to_date('12/24/1999','mm/dd/yyyy'), 'Blue_007', to_date('03/03/2006','mm/dd/yyyy'),
             to_date('07/10/2020','mm/dd/yyyy'), '2006' enrollment_cycle
        FROM DUAL)
SELECT FIRST_NM,LAST_NM,DATE_OF_BIRTH,ENROLLMENT_BEGN_DT,ENROLLMENT_END_DT,ENROLLMENT_CYCLE
  FROM T
  MODEL
  RETURN UPDATED ROWS
  PARTITION BY (FIRST_NM,LAST_NM)
  DIMENSION BY (1 ANNEE )
  MEASURES(ENROLLMENT_BEGN_DT,DATE_OF_BIRTH,ENROLLMENT_CYCLE,LEAST(  ENROLLMENT_END_DT, TRUNC(SYSDATE)) ENROLLMENT_END_DT)IGNORE NAV
  (  ENROLLMENT_BEGN_DT[FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT ( YEAR FROM ENROLLMENT_END_DT[1])   INCREMENT 1]  =  TO_DATE(TO_CHAR(ENROLLMENT_BEGN_DT[1],'MM/DD')||'/'||CV(ANNEE),'MM/DD/YYYY'),
     ENROLLMENT_END_DT [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT ( YEAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1]  =  TO_DATE('04/30'||(CASE WHEN EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) = 
                                                                                                                                                                                EXTRACT ( YEAR FROM ENROLLMENT_END_DT[1])  THEN CV(ANNEE) ELSE CV(ANNEE)+1 END)  ,'MM/DD/YYYY'),
     ENROLLMENT_CYCLE [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT ( YEAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1] =CV(ANNEE) ,
     DATE_OF_BIRTH [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT ( YEAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1] =DATE_OF_BIRTH[1])
SQL> WITH t AS
  2       (SELECT 'Jake' first_nm, 'Brown' last_nm, to_date('11/10/1999','mm/dd/yyyy') date_of_birth
  3               'Blue_007' class_id, to_date('07/10/2004','mm/dd/yyyy') enrollment_begn_dt,
  4               to_date('06/10/2007','mm/dd/yyyy') enrollment_end_dt, '2005' enrollment_cycle
  5          FROM DUAL
  6        UNION ALL
  7        SELECT 'Amy', 'Burrell', to_date('05/01/1999','mm/dd/yyyy'), 'Blue_007', to_date('01/20/2
005','mm/dd/yyyy'),
  8               to_date('05/01/2005','mm/dd/yyyy'), '2005' enrollment_cycle
  9          FROM DUAL
10        UNION ALL
11        SELECT 'Char', 'Goblin', to_date('12/24/1999','mm/dd/yyyy'), 'Blue_007', to_date('03/03/2
006','mm/dd/yyyy'),
12               to_date('07/10/2020','mm/dd/yyyy'), '2006' enrollment_cycle
13          FROM DUAL)
14  SELECT FIRST_NM,LAST_NM,DATE_OF_BIRTH,ENROLLMENT_BEGN_DT,ENROLLMENT_END_DT,ENROLLMENT_CYCLE
15    FROM T
16    MODEL
17    RETURN UPDATED ROWS
18    PARTITION BY (FIRST_NM,LAST_NM)
19    DIMENSION BY (1 ANNEE )
20    MEASURES(ENROLLMENT_BEGN_DT,DATE_OF_BIRTH,ENROLLMENT_CYCLE,LEAST(  ENROLLMENT_END_DT, TRUNC(S
YSDATE)) ENROLLMENT_END_DT)IGNORE NAV
21    (  ENROLLMENT_BEGN_DT[FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT
( YEAR FROM ENROLLMENT_END_DT[1])   INCREMENT 1]  =  TO_DATE(TO_CHAR(ENROLLMENT_BEGN_DT[1],'MM/DD')
||'/'||CV(ANNEE),'MM/DD/YYYY'),
22       ENROLLMENT_END_DT [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT
( YEAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1]  =  TO_DATE('04/30'||(CASE WHEN EXTRACT ( YEAR FROM
ENROLLMENT_BEGN_DT[1]) = 
23                                                                                                
                                                                                 EXTRACT ( YEAR FROM
ENROLLMENT_END_DT[1])  THEN CV(ANNEE) ELSE CV(ANNEE)+1 END)  ,'MM/DD/YYYY'),
24       ENROLLMENT_CYCLE [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT
( YEAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1] =CV(ANNEE) ,
25       DATE_OF_BIRTH [FOR ANNEE FROM   EXTRACT ( YEAR FROM ENROLLMENT_BEGN_DT[1]) TO  EXTRACT ( Y
EAR FROM ENROLLMENT_END_DT[1])  INCREMENT 1] =DATE_OF_BIRTH[1])
26    ;
FIRS LAST_NM DATE_OF_BI ENROLLMENT ENROLLMENT ENRO
Jake Brown   1999-11-10 2004-07-10 2005-04-30 2004
Jake Brown   1999-11-10 2005-07-10 2006-04-30 2005
Jake Brown   1999-11-10 2006-07-10 2007-04-30 2006
Jake Brown   1999-11-10 2007-07-10 2008-04-30 2007
Amy  Burrell 1999-05-01 2005-01-20 2005-04-30 2005
Char Goblin  1999-12-24 2006-03-03 2007-04-30 2006
Char Goblin  1999-12-24 2007-03-03 2008-04-30 2007
Char Goblin  1999-12-24 2008-03-03 2009-04-30 2008
Char Goblin  1999-12-24 2009-03-03 2010-04-30 2009
9 ligne(s) sélectionnée(s).