Need help with complex query with comma seperated

Question

Oracle version - 11.1.0.7.0
Consider there are two tables table1 and table2
Key---- ID
A ---- 1
A ---- 2
A---- 3
B ---- 4
B ---- 5
C ---- 6
C ---- 8
C ---- 9
C ---- 10
D ---- 11
D ---- 12
Table2
ID
1
2
6
8
11
12
I need result as in usedID column I should get comma seperated list of ID which are in table1 and table2 and in NOTUSEDID comma seperated list of ID which are in table1 but not in table2
Key---- USEDID---- NOTUSEDID
A ---- 1,2 ---- 3
B ---- null ---- 4,5
C ---- 6,8 ---- 9,10
D ---- 11,12 ---- null

Answer 1

Hi!
Solution for Oracle 11g:
SELECT A.KEY,
       listagg(decode(b.id, null, null, a.id), ',') WITHIN GROUP (ORDER BY  A.ID) AS USEDID,
       listagg(decode(b.id, null, a.id), ',') WITHIN GROUP (ORDER BY  A.ID) AS NOTUSEDID
  FROM TABLE1 A
       LEFT OUTER JOIN table2 b
       ON (A.ID = b.ID)
GROUP BY a.key;
Solution for databases prior to Oracle 11g:
Please note that the function wm_concat is undocumented and can't be sorted!
SELECT A.KEY,
       wm_concat(decode(b.id, null, null, a.id)) AS USEDID,
       wm_concat(decode(b.id, null, a.id)) AS NOTUSEDID
  FROM TABLE1 A
       LEFT OUTER JOIN table2 b
       ON (A.ID = b.ID)
GROUP BY A.KEY;I used the following test case:
create table table1(key varchar2(255), id number);
CREATE TABLE table2(ID NUMBER);
insert into table1 values('A', 1);
INSERT INTO table1 VALUES('A', 2);
INSERT INTO table1 values('A', 3);
INSERT INTO table1 VALUES('B', 4);
INSERT INTO table1 VALUES('B', 5);
INSERT INTO table1 VALUES('C', 6);
INSERT INTO table1 values('C', 8);
INSERT INTO table1 VALUES('C', 9);
INSERT INTO table1 VALUES('C', 10);
INSERT INTO table1 values('D', 11);
insert into table1 values('D', 12);
insert into table2 values(1);
insert into table2 values(2);
insert into table2 values(6);
insert into table2 values(8);
insert into table2 values(11);
insert into table2 values(12);
commit;Best regards,
Matt
Edited by: Matt Schulz on Oct 12, 2011 12:43 PM