Count before and after to certain occurance.

Question

I am trying to count the amount of units  studied before and after a certain Course was taken.
So ID 1 did PREP in 2013 in the first period and has and also had done a unit in 2009 so reult be before prerp count 1
ID 2 did PREP in 2012 first period and also an OTHER course in the same period as well as a OTHER in period 2. So when a PREP course appear in the same period and year as an OTHER course I would like it to count it as AFTER Prep.(see below(so when equal count as after PREP))
ID 3 has done one unit before before PREP which is in 2011 and 2 Units after the first PREP course.
I attepted this with not in and in statments basic I know but to no luck.
Any help is greatly appreciated.
Thanks
CREATE TABLE DAN_DIRK_2
(ID     VARCHAR2(8),
YEAR    VARCHAR2(8),
PERIOD VARCHAR2(8),
COURSE VARCHAR2(12),
UNIT VARCHAR2(12));
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (1,'2013','SP1','PREP','PLI');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (1,'2009','SP4','OTHER','DRI');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (2,'2012','SP1','OTHER','FER');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (2,'2012','SP2','OTHER','AQW');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (2,'2012','SP1','PREP','FGV');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (3,'2011','SP1','OTHER','GVW');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (3,'2012','SP2','PREP','FER');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (3,'2013','SP1','OTHER','FSW');
INSERT INTO DAN_DIRK_2 (ID, YEAR,PERIOD,COURSE,UNIT) VALUES (3,'2013','SP1','PREP','FGH');
GIVES:
ID
YEAR
PERIOD
COURSE
UNIT
1
2013
SP1
PREP
PLI
1
2009
SP4
OTHER
DRI
2
2012
SP1
OTHER
FER
2
2012
SP2
OTHER
AQW
2
2012
SP1
PREP
FGV
3
2011
SP1
OTHER
GVW
3
2012
SP2
PREP
FFR
3
2013
SP1
OTHER
FSW
3
2013
SP1
PREP
FGH
WANT:
ID
BEFORE
AFTER
1
1
0
2
0
2
3
1
2

Answer 1

Chloe_19 wrote:
Get an Error
ORA-32033: unsupported column aliasing
32033. 00000 -  "unsupported column aliasing"
*Cause:    column aliasing in WITH clause is not supported yet
*Action:   specify aliasing in defintion subquery and retry
Error at Line: 1 Column: 8
Am using version:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
because you use 10g, try this :
WITH tt AS (
select 1 ID,  2013 YR,  'SP1' PERIOD,  'PREP' COURSE,  'PLI' UNIT from dual union all
select 1,  2009,  'SP4',  'OTHER',  'DRI' from dual union all
select 2,  2012,  'SP1',  'OTHER',  'FER' from dual union all
select 2,  2012,  'SP2',  'OTHER',  'AQW' from dual union all
select 2,  2012,  'SP1',  'PREP',  'FGV' from dual union all
select 3,  2011,  'SP1',  'OTHER',  'GVW' from dual union all
select 3,  2012,  'SP2',  'PREP',  'FFR' from dual union all
select 3,  2013,  'SP1',  'OTHER',  'FSW' from dual union all
select 3,  2013,  'SP1',  'PREP',  'FGH' from dual ),
tt2 AS (
SELECT t.ID,
       min(t.YR) minyr, 
       min(replace(t.PERIOD,'SP','')) KEEP(DENSE_RANK FIRST ORDER BY T.YR) minpr
FROM  tt t
WHERE t.COURSE = 'PREP'
GROUP BY t.ID)
    SELECT ID,
           NVL(COUNT(BEF),0) BEFORE,
           NVL(COUNT(AFT),0) AFTER
           FROM(          
                    SELECT t1.ID,
                           (CASE WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')= t2.minpr AND t1.course='PREP' THEN NULL
                                 WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')= t2.minpr AND t1.course!='PREP' THEN NULL
                                 WHEN t1.YR < t2.minyr THEN -1
                                 WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')<= t2.minpr THEN -1
                             END) BEF,
                           (CASE WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')= t2.minpr AND t1.course='PREP' THEN NULL
                                 WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')= t2.minpr AND t1.course!='PREP' THEN 1
                                 WHEN t1.YR > t2.minyr THEN 1
                                 WHEN t1.YR = t2.minyr AND replace(t1.PERIOD,'SP','')>= t2.minpr THEN 1
                             END) AFT        
                     FROM tt t1
                    LEFT JOIN tt2 t2
                           ON t2.id = t1.id
    GROUP BY ID
    ORDER BY 1