ORA-00984: Column not allowed here.

Question

Hi there, I've got a little problem with the ORA-00984 error. I just begun PL/SQL, so maybe you can support me with this.
I want to write a Trigger that fires every time a row in a table is changed or deleted. Trigger should write the following into a seperate table:
[mumblejumble ...]
THEN
INSERT INTO "PROJECT"."T_HISTORY" (subtopic_id, change_date, old_schedule_date, old_description, changes_id) VALUES (
var_subtopic_id,
TO_DATE(sysdate,'DD.MM.YY'),
var_old_schedule_date,
var_old_decription,
'1');
troublemaker is this line:
TO_DATE(sysdate,'DD.MM.YY'),
Gives ORA-00984. I tried a single sysdate as well, same problem.
Somebody got a clue or workaround? I can't figure out how to insert the sysdate another way.
Regards,
Thomas

Answer 1

Here you go, this is the current version:
CREATE OR REPLACE
TRIGGER TRIGGER_TEST_HISTORY BEFORE UPDATE OR DELETE ON T_SUBTOPICS
DECLARE
var_subtopic_id NUMBER(6);
var_old_schedule_date DATE;
var_old_description VARCHAR2(1000);
BEGIN
/* Trigger soll Datensätze nach t_history kopieren, zusammen mit einer Beschreibung der Änderung!
/* Datensätze aus Tabelle holen */
SELECT subtopic_id, schedule_date, description INTO var_subtopic_id, var_old_schedule_date, var_old_description FROM t_subtopics;
/* Abfragen, wie geändert wurde */
IF UPDATING
THEN
INSERT INTO "PROJECT"."T_HISTORY" (subtopic_id, change_date, old_schedule_date, old_description, changes_id) VALUES (
var_subtopic_id,
sysdate,
var_old_schedule_date,
var_old_decription,
'1');
/* Oder gelöscht? */
ELSIF DELETING
THEN
INSERT INTO "PROJECT"."T_HISTORY" (subtopic_id, change_date, old_schedule_date, old_description, changes_id) VALUES (
var_subtopic_id,
sysdate,
var_old_schedule_date,
var_old_decription,
'2');
END IF;
END;
Pretty primitive, but that was the first way that came into my mind.
Edited spelling mistake
Message was edited by:
Thomas Anders