Trigger that makes concatenation rows into cols and inserts to another tab.

Question

Hi,
I have a trigger to do. Let me explain you how everything looks like in my DB.
TABLE A
O_ID | NAME
1 | A_Name1
2 | A_Name2
3 | A_Name3
4 | A_Name4
TABLE B
O_ID | NAME | DATE
1 | ATT_15 |2011-01-01
1 | ATT_16 |2011-01-02
2 | ATT_15 |2011-03-03
4 | ATT_19 |2011-03-05
TABLE C (dictionary)
P_ID | P_NAMEATTRIBUTE
1 | P1
2 | P2
3 | P3
4 | P4
TABLE D
O_ID | P_ID
1 | 1
1 | 2
1 | 4
2 | 3
2 | 4
4 | 2
Basicly, all I'm trying to do is make a trigger based on:
When you update Table A do an insert into Table B. What should be inserted?
All ID’s from table C that matches trough TABLE D
A.O_ID = D.O_ID and C.P_ID = D.P_ID but concatenated.
I would like to have in this case inserted into table B records like that:
O_ID | P_ID | P_NAMEATTRIBUTE
1 | 1 2 | P1 P2 P4
2 | 3 4 | P3 P4
4 | 2 | P2
Let's hope it's comprehensive. :)
Regards!

Answer 1

nodex wrote:
I have tried to fire procedure from trigger. It works almost fine but there is always one row less than expected. I tried to reconfigure trigger in many ways but it didn't help.I meant show us an example your code with some data so we can see what you're doing.
It's not really hard to concatenate rows into columns (wm_concat e.g.). It's hard to store it in a trigger.I wouldn't use wm_concat as it is an unsupported function, which can render your whole system unsupported by Oracle if the issue is found to be due to you using that. Also, Oracle can choose to change the functionality of that function in later versions if they want which could effect your expected output.
In 10g or below, you should use sys_connect_by_path method to aggregate data. In 11gR2 there is the new LISTAGG analytical function.
Saying "It's hard to store it in a trigger" doesn't tell us anything. Why is it hard? What problem are you experiencing?