Query to get the hierarchical results

Question

Hi,
Please help me in writing a Query to get the hierarchical results. I want a result like follows...
course-----groupname---TotalMembers---NotStarted---INProgress---Completed
Course1---country1--------12---------------6----------3-------------3
Course1-----state11-------12---------------6----------3-------------3
Course1------District111--10---------------5----------0-------------0
Course1--------City1111----0---------------0----------0-------------0
Course1--------City1112----1---------------0----------0-------------1
Course1--------City1113----6---------------3----------2-------------1
Course1---country2--------12---------------6----------3-------------3
Course1----state21--------12---------------6----------3-------------3
Course1------District211--10---------------5----------0-------------0
Course1--------City2111----0---------------0----------0-------------0
Course1--------City2112----1---------------0----------0-------------1
Course1--------City2113----6---------------3----------2-------------1
Course2---country1--------12---------------6----------2-------------3
Course2----state11--------12---------------6----------2-------------3
Course2------District111--10---------------5----------0-------------0
Course2--------City1111----0---------------0----------0-------------0
Course2--------City1112----1---------------0----------0-------------1
Course2--------City1113----6---------------3----------1-------------2
Course2---country2--------12---------------6----------3-------------3
Course2-----state21-------12---------------6----------3-------------3
Course2------District211--10---------------5----------0-------------0
Course2--------City2111----0---------------0----------0-------------0
Course2--------City2112----1---------------0----------0-------------1
Course2--------City2113----6---------------3----------2-------------1
These are the Tables available to me.
(I have just given some examle data in tables, to get the idea)
"Groups" Table (This table gives the information of the group)
GROUPID-----NAME-------PARENTID
1---------Universe--------1
2---------country1--------1
3---------state11---------2
4---------District111-----3
5---------City1111--------4
6---------City1112--------4
7---------City1113--------4
8---------country2--------1
9---------state21---------8
10--------District211-----9
11--------City2111--------10
12--------City2112--------10
13--------City2113--------10
"Users" Table (This table provides the user information)
userID----FIRSTNAME---LASTNAME
user1-----------Jim-------Carry
user2-----------Tom-------lee
user3-----------sunny-----boo
user4-----------mary------mall
"User-Group" Tables (This table provides the relation between the groups
and the members)
GROUPID---userID
3-------------user1
3-------------user2
3-------------user4
4-------------user5
5-------------user6
5-------------user7
user_score (This table provides the user scores of different courses)
USERID----course-----STATUS
user1------course1-----complete
user1------course2-----NotStarted
user2------course1-----NotStarted
user2------course2-----complete
user3------course1-----complete
user3------course2-----InProgress
user4------course2-----complete
user4------course1-----NotStarted
I will explain the first four lines of the above result.
Course1---country1--------12---------------6----------4-------------2
Course1-----state11-------12---------------6----------4-------------2
Course1------District111--10---------------5----------3-------------2
Course1--------City1111----0---------------0----------0-------------0
Course1--------City1112----1---------------0----------0-------------1
Course1--------City1113----6---------------3----------2-------------1
# "city1111" group has 0 members
# "city1112" group has 1 member (1 member completed the course1)
# "city1113" group has 6 members(3 members notStarted,2 members
InProgress,1 member completed the course1)
# "District111" is the parent group of above three groups, and has 3
members.(2 members NotStarted,1 member InProgress the course1). But this
group has child groups, so the scores of this group has to rollup the
child groups scores also. Thats why it has 2+3+0+0=6 members Not
Started,1+2+0+0=3 members InProgress,0+0+1+1=2 members completed.
# "state11" group also same as the above group.
I am able to get the group hierarchy by using "Connect By" like follows
"select name,groupid,parentid from groups_info start with groupid=1 connect by parentid = prior groupid;"
But i want to get the result as i have mentioned in the begining of this discussion.
I am using oracle 8i (oracle8.1.7).
Thank you for any help
Srinivas M

Answer 1

This may not be exactly what you want,
but it should be fairly close:
SET      LINESIZE 100
SET      PAGESIZE 24
COLUMN   groupname FORMAT A20
SELECT   INITCAP (user_score.course) "course",
         groupnames.name "groupname",
         COUNT (*) "TotalMembers",
         SUM (NVL (DECODE (UPPER (user_score.status), 'NOTSTARTED', 1), 0)) "NotStarted",
         SUM (NVL (DECODE (UPPER (user_score.status), 'INPROGRESS', 1), 0)) "InProgress",
         SUM (NVL (DECODE (UPPER (user_score.status), 'COMPLETE', 1), 0)) "Completed"
FROM     user_score,
         user_group,
         (SELECT ROWNUM rn,
                 name,
                 groupid
          FROM   (SELECT     LPAD (' ', 2 * LEVEL - 2) || name AS name,
                             groupid
                  FROM       groups
                  START WITH groupid = 1
                  CONNECT BY PRIOR groupid = parentid)) groupnames
WHERE    user_score.userid = user_group.userid
AND      user_group.groupid IN
         (SELECT     groupid
          FROM       groups
          START WITH groupid = groupnames.groupid
          CONNECT BY PRIOR groupid = parentid)
GROUP BY user_score.course, groupnames.name, groupnames.rn
ORDER BY user_score.course, groupnames.rn
I entered the minimal test data that you
provided and a bit more and got this result
(It was formatted as you requested,
but I don't know if it will display properly
on this post, or wrap around):
course  groupname            TotalMembers NotStarted InProgress  Completed
Course1 Universe                        6          2          0          4
Course1   country1                      5          2          0          3
Course1     state11                     5          2          0          3
Course1       District111               2          0          0          2
Course1         City1112                1          0          0          1
Course1         City1113                1          0          0          1
Course1   country2                      1          0          0          1
Course1     state21                     1          0          0          1
Course1       District211               1          0          0          1
Course1         City2113                1          0          0          1
Course2 Universe                        5          1          1          3
Course2   country1                      4          1          1          2
Course2     state11                     4          1          1          2
Course2       District111               1          0          1          0
Course2         City1113                1          0          1          0
Course2   country2                      1          0          0          1
Course2     state21                     1          0          0          1
Course2       District211               1          0          0          1
Course2         City2113                1          0          0          1
Here is the test data that I used, in case
anyone else wants to play with it:
create table groups
  (groupid  number,
   name     varchar2(15),
   parentid number)
insert into groups
values (1,'Universe',null)
insert into groups
values (2,'country1',1)
insert into groups
values (3,'state11',2)
insert into groups
values (4,'District111',3)
insert into groups
values (5,'City1111',4)
insert into groups
values (6,'City1112',4)
insert into groups
values (7,'City1113',4)
insert into groups
values (8,'country2',1)
insert into groups
values (9,'state21',8)
insert into groups
values (10,'District211',9)
insert into groups
values (11,'City2111',10)
insert into groups
values (12,'City2112',10)
insert into groups
values (13,'City2113',10)
create table user_group
  (groupid number,
   userid  varchar2(5))
insert into user_group
values (3,'user1')
insert into user_group
values (3,'user2')
insert into user_group
values (3,'user4')
insert into user_group
values (4,'user5')
insert into user_group
values (5,'user6')
insert into user_group
values (5,'user7')
insert into user_group
values (7,'user8')
insert into user_group
values (13,'user9')
insert into user_group
values (11,'use11')
insert into user_group
values (6,'use6')
create table user_score
  (userid varchar2(5),
   course varchar2(7),
   status varchar2(10))
insert into user_score
values ('use6','course1','complete')
insert into user_score
values ('user9','course1','complete')
insert into user_score
values ('user9','course2','complete')
insert into user_score
values ('user8','course1','complete')
insert into user_score
values ('user8','course2','InProgress')
insert into user_score
values ('user1','course1','complete')
insert into user_score
values ('user1','course2','NotStarted')
insert into user_score
values ('user2','course1','NotStarted')
insert into user_score
values ('user2','course2','complete')
insert into user_score
values ('user3','course1','complete')
insert into user_score
values ('user3','course2','InProgress')
insert into user_score
values ('user4','course2','complete')
insert into user_score
values ('user4','course1','NotStarted')