How to do outer join select query for an APEX report

Question

Hello everyone,
I am Ann.
I have one select statement that calculate the statistics for one month(October 2012 in this example)
select ph.phase_number
, sum ( (case
WHEN ph.date_finished IS NULL OR ph.date_finished > last_day(TO_DATE('Oct 2012','MON YYYY'))
THEN last_day(TO_DATE('Oct 2012','MON YYYY'))
ELSE ph.date_finished
END )
- ph.date_started + 1) / count(def.def_id) as avg_days
from phase_membership ph
inner join court_engagement ce on ph.mpm_eng_id = ce.engagement_id
inner join defendant def on ce.defendant_id = def.def_id
where def.active = 1
and ph.date_started <= last_day(TO_DATE('Oct 2012','MON YYYY'))
and ph.active = 1
and UPPER(ce.court_name) LIKE '%'
group by rollup(phase_number)
Result is as below
Phase_Number     AVG_DAYS
Phase One     8.6666666666666667
Phase Two     14.6
Phase Three     12
     11.4615365
I have other select list mainly list the months between two date value.
select to_char(which_month, 'MON YYYY') as display_month
from (
select add_months(to_date('Aug 2012','MON YYYY'), rownum-1) which_month
from all_objects
where
rownum <= months_between(to_date('Oct 2012','MON YYYY'), add_months(to_date('Aug 2012','MON YYYY'), -1))
order by which_month )
Query result is as below
DISPLAY_MONTH
AUG 2012
SEP 2012
OCT 2012
Is there any way that I can join these two select statement above to generate a result like:
Month          Phase Number     Avg days
Aug 2012     Phase One     8.666
Sep 2012     Phase One     7.66
Oct 2012     Phase One     5.66
Aug 2012     Phase Two     8.666
Sep 2012     Phase Two     7.66
Oct 2012     Phase Two     5.66
Aug 2012     Phase Three     8.666
Sep 2012     Phase Three     7.66
Oct 2012     Phase Three     5.66
Or
Month          Phase Number     Avg days
Aug 2012     Phase One     8.666
Aug 2012     Phase Two     7.66
Aug 2012     Phase Three     5.66
Sep 2012     Phase One     8.666
Sep 2012     Phase Two     7.66
Sep 2012     Phase Three     5.66
Oct 2012     Phase One     8.666
Oct 2012     Phase Two     7.66
Oct 2012     Phase Three     5.66
And it can be order by either Phase Number or Month.
My other colleague suggest I should use an left outer join but after trying so many ways, I am still stuck.
One of the select I tried is
select a.display_month,b.* from (
select to_char(which_month, 'MON YYYY') as display_month
from (
select add_months(to_date('Aug 2012','MON YYYY'), rownum-1) which_month
from all_objects
where
rownum <= months_between(to_date('Oct 2012','MON YYYY'), add_months(to_date('Aug 2012','MON YYYY'), -1))
order by which_month )) a left outer join
( select to_char(ph.date_finished,'MON YYYY') as join_month, ph.phase_number
, sum ( (case
WHEN ph.date_finished IS NULL OR ph.date_finished > last_day(TO_DATE(a.display_month,'MON YYYY'))
THEN last_day(TO_DATE(a.display_month,'MON YYYY'))
ELSE ph.date_finished
END )
- ph.date_started + 1) / count(def.def_id) as avg_days
from phase_membership ph
inner join court_engagement ce on ph.mpm_eng_id = ce.engagement_id
inner join defendant def on ce.defendant_id = def.def_id
where def.active = 1
and ph.date_started <= last_day(TO_DATE(a.display_month,'MON YYYY'))
and ph.active = 1
and UPPER(ce.court_name) LIKE '%'
group by to_char(ph.date_finished,'MON YYYY') , rollup(phase_number)) b
on a.display_month = b.join_month
but then I get an error
SQL Error: ORA-00904: "A"."DISPLAY_MONTH": invalid identifier
I need to display a report on APEX with option for people to download at least CSV format.
I already have 1 inteactive report in the page, so don’t think can add another interactive report without using the iframe trick.
If any of you have any ideas, please help.
Thanks a lot.
Ann

Answer 1

First of all, a huge thanks for following this Frank.
I have just started working here, I think the Oracle version is 11g, but not sure.
To run Oracle APEX version 4, I think they must have at least 10g R2.
This report is a bit challenging for me.I has never worked with PARTITION before.
About the select query you suggested, I run , and it seems working fine, but if I try this,
it return error ORA-01843: not a valid month
DEFINE startmonth = "Aug 2012";
DEFINE endmonth   = "Oct 2012";
WITH     all_months     AS
     select add_months(to_date('&startmonth','MON YYYY'), rownum-1) AS which_month
     ,      add_months(to_date('&startmonth','MON YYYY'), rownum  ) AS next_month
     from all_objects
     where
     rownum <= months_between(to_date('&endmonth','MON YYYY'), add_months(to_date('&startmonth','MON YYYY'), -1))
select TO_CHAR (am.which_month, 'Mon YYYY')     AS month
,      ph.phase_number
, sum ( (case
WHEN ph.date_finished IS NULL OR ph.date_finished > last_day(TO_DATE(am.which_month,'MON YYYY'))
THEN last_day(TO_DATE(am.which_month,'MON YYYY'))
ELSE ph.date_finished
END )
- ph.date_started + 1) / count(def.def_id) as avg_days
FROM           all_months          am
LEFT OUTER JOIN  phase_membership  ph  PARTITION BY (ph.phase_number)
                                    ON  am.which_month <= ph.date_started
                           AND am.next_month  >  ph.date_started
                           AND ph.date_started <= last_day(TO_DATE(am.which_month,'MON YYYY'))  -- May not be needed
                           AND ph.active = 1
LEFT OUTER join  court_engagement  ce  on  ph.mpm_eng_id = ce.engagement_id
                                    and ce.court_name IS NOT NULL  -- or something involving LIKE
LEFT OUTER join  defendant         def on  ce.defendant_id = def.def_id
                                    AND def.active = 1
group by rollup(phase_number, am.which_month)
ORDER BY  am.which_month
,            ph.phase_number
;Here is the shorted versions of the three tables:
A_DEFENDANT, A_ENGAGEMENT, A_PHASE_MEMBERSHIP
CREATE TABLE "A_DEFENDANT"
    "DEF_ID"     NUMBER NOT NULL ENABLE,
    "FIRST_NAME" VARCHAR2(50 BYTE),
    "SURNAME"    VARCHAR2(20 BYTE) NOT NULL ENABLE,
    "DOB" DATE NOT NULL ENABLE,
    "ACTIVE" NUMBER(2,0) DEFAULT 1 NOT NULL ENABLE,
    CONSTRAINT "A_DEFENDANT_PK" PRIMARY KEY ("DEF_ID"))
Sample Data
Insert into A_DEFENDANT (DEF_ID,FIRST_NAME,SURNAME,DOB,ACTIVE) values (101,'Joe','Bloggs',to_date('12/12/99','DD/MM/RR'),1);
Insert into A_DEFENDANT (DEF_ID,FIRST_NAME,SURNAME,DOB,ACTIVE) values (102,'John','Smith',to_date('20/05/00','DD/MM/RR'),1);
Insert into A_DEFENDANT (DEF_ID,FIRST_NAME,SURNAME,DOB,ACTIVE) values (103,'Jane','Black',to_date('15/02/98','DD/MM/RR'),1);
Insert into A_DEFENDANT (DEF_ID,FIRST_NAME,SURNAME,DOB,ACTIVE) values (104,'Minnie','Mouse',to_date('13/12/88','DD/MM/RR'),0);
Insert into A_DEFENDANT (DEF_ID,FIRST_NAME,SURNAME,DOB,ACTIVE) values (105,'Daisy','Duck',to_date('05/08/00','DD/MM/RR'),1);
CREATE TABLE "A_ENGAGEMENT"
    "ENGAGEMENT_ID" NUMBER NOT NULL ENABLE,
    "COURT_NAME"    VARCHAR2(50 BYTE) NOT NULL ENABLE,
    "DATE_REFERRED" DATE,
    "DETERMINATION_HEARING_DATE" DATE,
    "DATE_JOINED_COURT" DATE,
    "DATE_TREATMENT_STARTED" DATE,
    "DATE_TERMINATED" DATE,
    "TERMINATION_TYPE" VARCHAR2(50 BYTE),
    "ACTIVE"           NUMBER(2,0) DEFAULT 1 NOT NULL ENABLE,
    "DEFENDANT_ID"     NUMBER,
    CONSTRAINT "A_ENGAGEMENT_PK" PRIMARY KEY ("ENGAGEMENT_ID"))
Insert into A_ENGAGEMENT (ENGAGEMENT_ID,COURT_NAME,DATE_REFERRED,DETERMINATION_HEARING_DATE,DATE_JOINED_COURT,DATE_TREATMENT_STARTED,DATE_TERMINATED,TERMINATION_TYPE,ACTIVE,DEFENDANT_ID) values (1,'AA',to_date('12/08/12','DD/MM/RR'),null,to_date('12/08/12','DD/MM/RR'),null,null,null,1,101);
Insert into A_ENGAGEMENT (ENGAGEMENT_ID,COURT_NAME,DATE_REFERRED,DETERMINATION_HEARING_DATE,DATE_JOINED_COURT,DATE_TREATMENT_STARTED,DATE_TERMINATED,TERMINATION_TYPE,ACTIVE,DEFENDANT_ID) values (2,'BB',to_date('01/09/12','DD/MM/RR'),null,to_date('02/09/12','DD/MM/RR'),null,null,null,1,102);
Insert into A_ENGAGEMENT (ENGAGEMENT_ID,COURT_NAME,DATE_REFERRED,DETERMINATION_HEARING_DATE,DATE_JOINED_COURT,DATE_TREATMENT_STARTED,DATE_TERMINATED,TERMINATION_TYPE,ACTIVE,DEFENDANT_ID) values (3,'AA',to_date('02/09/12','DD/MM/RR'),null,to_date('15/09/12','DD/MM/RR'),null,null,null,1,103);
Insert into A_ENGAGEMENT (ENGAGEMENT_ID,COURT_NAME,DATE_REFERRED,DETERMINATION_HEARING_DATE,DATE_JOINED_COURT,DATE_TREATMENT_STARTED,DATE_TERMINATED,TERMINATION_TYPE,ACTIVE,DEFENDANT_ID) values (4,'BB',to_date('01/10/12','DD/MM/RR'),null,to_date('02/10/12','DD/MM/RR'),null,null,null,1,105);
CREATE TABLE "A_PHASE_MEMBERSHIP"
    "MPM_ID"       NUMBER NOT NULL ENABLE,
    "MPM_ENG_ID"   NUMBER NOT NULL ENABLE,
    "PHASE_NUMBER" VARCHAR2(50 BYTE),
    "DATE_STARTED" DATE NOT NULL ENABLE,
    "DATE_FINISHED" DATE,
    "NOTES"  VARCHAR2(2000 BYTE),
    "ACTIVE" NUMBER(2,0) DEFAULT 1 NOT NULL ENABLE,
    CONSTRAINT "A_PHASE_MEMBERSHIP_PK" PRIMARY KEY ("MPM_ID"))
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (1,1,'PHASE ONE',to_date('15/09/12','DD/MM/RR'),to_date('20/09/12','DD/MM/RR'),null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (2,1,'PHASE TWO',to_date('21/09/12','DD/MM/RR'),to_date('29/09/12','DD/MM/RR'),null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (3,2,'PHASE ONE',to_date('12/09/12','DD/MM/RR'),null,null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (4,3,'PHASE ONE',to_date('20/09/12','DD/MM/RR'),to_date('01/10/12','DD/MM/RR'),null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (5,3,'PHASE TWO',to_date('02/10/12','DD/MM/RR'),to_date('15/10/12','DD/MM/RR'),null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (6,4,'PHASE ONE',to_date('03/10/12','DD/MM/RR'),to_date('10/10/12','DD/MM/RR'),null,1);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (7,3,'PHASE THREE',to_date('17/10/12','DD/MM/RR'),null,null,0);
Insert into A_PHASE_MEMBERSHIP (MPM_ID,MPM_ENG_ID,PHASE_NUMBER,DATE_STARTED,DATE_FINISHED,NOTES,ACTIVE) values (8,1,'PHASE THREE',to_date('30/09/12','DD/MM/RR'),to_date('16/10/12','DD/MM/RR'),null,1);
The requirements are:
The user must be able to request the extract for one or more calendar months, e.g.
May 2013
May 2013 – Sep 2013.
The file must contain a separate row for each calendar month in the requested range. Each row must contain the statistics computed for that calendar month.
The file must also include a row of totals.
The user must be able to request the extract for either Waitakere or Auckland or Consolidated (both courts’ statistics accumulated).
Then the part that I am stuck is
For each monitoring phase:
Phase name (e.g. “Phase One”)
Avg_time_in_phase_all_particip
for each phase name,
Add up days in each “phase name” Monitoring Phase, calculated as:
If Monitoring Phase.Date Finished is NULL or > month end date,
+(*Month end date* Minus Monitoring Phase.Date Started Plus 1)+
Otherwise (phase is complete)
+(Monitoring Phase.Date Finished Minus Monitoring Phase.Date Started Plus 1.)+
Divide by the numbers of all participants who have engaged in “phase name”.
This is the words of the Business Analyst,
I try to do as required but still struggle to identify end_month for the above formula to display for the range of months.
Of course, I can write two nested cursor. The first one run the list of month, then for each month, run the parameterised report.
But I prefer if possible just use SQL statements, or at least a PL/SQL but return a query.
With this way, I can create an APEX report, and use their CSV Extract function.
Yes, you are right, court_name is one of the selection parameters.
And the statistics is not exactly for one month. It is kind of trying to identify all phases that are running through the specified month (even phase.date_started is before the month start).
This is the reason why I put the condition AND ph.date_started <= last_day(TO_DATE('Oct 2012','MON YYYY')) (otherwise I get negative avg_days)
User can choose either one court "AA" or "BB" or combined which is all figures.
Sorry for bombarding you a lot of information.
Thanks a lot, again.
Edited by: Ann586341 on Oct 29, 2012 9:57 PM
Edited by: Ann586341 on Oct 29, 2012 9:59 PM