join of tables inside the trigger

I will set the value of a column in a trigger based on one join between other: new value and a table, but it does not work. Cannot select on one: new.column inside the trigger? If not, then all the ideas on how to do this simple thing? I may need to call a function with the: new.column value but don't know if I'm having the same problem. sillySql. Thank you.

create the table codetab
(ct_id number (6))
ct_value varchar2 (6));

create the table bustab
(bt_id, number (6))
bct_id number (6).
bt_value varchar2 (6));

insert into codetab values
(1, 'AAA');
insert into codetab values
(2, 'BBB');

create or replace trigger bustrig
Before Insert on bustab for each line
Begin
Select codetab.ct_value in: new.bt_value
of codetab, bustab
where: new.bct_id = codetab.ct_id;
end;
/

insert into bustab values
(1, 1, null);

insert into bustab values
*
ERROR on line 1:
ORA-01403: no data found
ORA-06512: at "ELLEPEUTNEANMOINS. BUSTRIG', line 2
ORA-04088: error during execution of trigger ' ELLEPEUTNEANMOINS. BUSTRIG'

Hello

The problem isn't with the: NEW values, it is with the table.
A FOR EACH ROW trigger on bustab can't question bustab.
However, you don't need to ask bustab. Codeteb is the only table you must ask:

create or replace trigger bustrig
before insert on bustab for each row
Begin
    select  ct_value
    into    :new.bt_value
    from    codetab
    where   :new.bct_id = ct_id;
end;

Tags: Database

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======

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****
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get information from inside a trigger of the other tables in the schema even
Addendum:

... Sorry I forgot: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64 bit

*******************

Hello

I'm trying for a few hours to get information from inside a trigger to another table in the same pattern.

My trigger is PSE_BKB. NUM_PHANTOM_BP

I first tried a simple solution...

CREATE OR REPLACE TRIGGER PSE_BKB. NUM_TR_PHANTOM_BP
BEFORE DELETING, INSERTION OR UPDATE
ON PSE_BKB. NUM_PHANTOM_BP
REFERRING AGAIN AS NINE OLD AND OLD
FOR EACH LINE
DECLARE

v_recht NUMBER (1): = 0;
v_recht2 NUMBER (1): = 0;
v_change_mitarbeiter NUMBER (1): = 0;
v_recht_mitarbeiter NUMBER (1): = 0;
v_typ varchar2 (20);
v_obj_key varchar2 (11): = "gugus";
v_ph_key varchar2 (11);
-ph_key varchar2 (11);
v_obj_keys varchar2 (4000): = ', ';

anz_num NUMBER: = 0;
anz_num_tmp NUMBER: = 0;
anz_st_si NUMBER: = 0;

BEGIN

...
Select count (*)
in anz_num
of pse_bkb.num_objekt o
where o.obj_key in
(select distinct (ov.obj_key)
of pse_bkb.num_objekt_verb ov
where ov.phantom_key =: old.phantom_key
)
and o.typ = "NUM";

...

Explanation: my trigger table is PSE_BKB. NUM_PHANTOM_BP.

On the pse_bkb.num_objekt_verb of the table, I have a relationship 1: n to one or several object-key (field named obj_key!) on my referenced key: old.phantom_key. With this obj_key, I want to watch the weather, I have one or more lines in the table type num_objekt "NUM". So the internal selection gives me all the num_objekt_verb obj_key with my: old.phantom_key and with whom I count the number of lines I have on num_objekt with type "NUM".

The problem is that the trigger does not see the table.

I tried many variations.

The latest version I tried was with a cursor inside the trigger definition as in the block of code below.

For debugging purposes, I inserted a RAISE_APPLICATION_ERROR in the inner loop - see below. The v_obj_key variable is never defined, as in all the other variations, I tried-, I still see the predefined "gugus" in the declare section.

It seems that oracle can not read other tables at this point. La: old.phantom_key is defined (in this simple example there would come a return obj_key).

Thanks in advance for your help - and excuse my English.

Trigger code:

CREATE OR REPLACE TRIGGER PSE_BKB. NUM_TR_PHANTOM_BP
BEFORE DELETING, INSERTION OR UPDATE
ON PSE_BKB. NUM_PHANTOM_BP
REFERRING AGAIN AS NINE OLD AND OLD
FOR EACH LINE
DECLARE

v_recht NUMBER (1): = 0;
v_recht2 NUMBER (1): = 0;
v_change_mitarbeiter NUMBER (1): = 0;
v_recht_mitarbeiter NUMBER (1): = 0;
v_typ varchar2 (20);
v_obj_key varchar2 (11): = "gugus";
v_ph_key varchar2 (11);
-ph_key varchar2 (11);
v_obj_keys varchar2 (4000): = ', ';

anz_num NUMBER: = 0;
anz_num_tmp NUMBER: = 0;
anz_st_si NUMBER: = 0;

BEGIN

Start
declare

cursor nums is

Select obj_key
of PSE_BKB.num_objekt_verb
where phantom_key =: old.phantom_key;

Start

for the RC looping nums
v_obj_key: = cr.obj_key;

RAISE_APPLICATION_ERROR (-20099,' AGAIN 9 v_obj_key: ' | v_obj_key |) ': old.phantom_key ' | (: old.phantom_key);

When the exit nums % NOTFOUND;

Select count (*) in the pse_bkb.num_objekt anz_num_tmp where obj_key = v_obj_key and type = "NUM";
anz_num: = anz_num + anz_num_tmp;
end loop;

end;
end;

Published by: user832075 on 14.01.2013 06:18
The reason why you get count_n = 0 in tr_c is that there is no line in B with key_c = 17, to the moment you arrive at tr_c. The removal of B has already occurred, and since you're in a single transaction, the application for tr_c:
```
select count(*)
  into   counter_n
  from   a aa
  where  aa.key_a in (select distinct(bb.key_a)
                      from   b bb
                      where  bb.key_c = v_ph_key
                     )
  and    aa.typ = 'n';
```
'knows' that the row has been deleted then gets a number of 0.

I added a set of instructions dbms_output to show the order in which triggers run, and that's what I get:
```
SQL> delete from b_vw where key_a = 1 and key_c = 17 ;
in trigger b_tr_vw
In tr_b
in tr_c
delete from b_vw where key_a = 1 and key_c = 17
            *
ERROR at line 1:
ORA-20077: Remark: counter_n: 0 counter_s: 0 v_ph_key: 17 old.key_c: 17
new.key_c:
ORA-06512: at "OPS$ORACLE.TR_C", line 38
ORA-04088: error during execution of trigger 'OPS$ORACLE.TR_C'
ORA-06512: at "OPS$ORACLE.B_TR_VW", line 17
ORA-04088: error during execution of trigger 'OPS$ORACLE.B_TR_VW'
```
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Because I have really no idea what you're trying to accomplish here I can't offer a lot of advice that you might want to try entering two tr_c of the tr_b_vw trigger validation queries before deliver you the removal of b and put the counter_n > 0 and counter_s = 0 control under tr_b_vw to decide whether or not you want to remove.

John

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procedure b)
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```
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  2  as
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```
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join of tables inside the trigger

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