Update and Delete Oracle Trigger - oracle

Question

Posted a question a couple of days ago and successfully got my trigger to work!
But having a few new problems.
I have two tables:
CREATE TABLE "ASSESSMENT"
( "ASSESSMENT_NAME" VARCHAR2(50) NOT NULL ENABLE,
"DEADLINE_DATE" DATE NOT NULL ENABLE,
CONSTRAINT "ASSESSMENT_PK" PRIMARY KEY ("ASSESSMENT_NAME") ENABLE
)
CREATE TABLE "ASSESSMENT_ANNOUNCEMENT"
( "ASSESSMENT_NAME" VARCHAR2(50) NOT NULL ENABLE,
"DEADLINE_DATE" DATE NOT NULL ENABLE,
"ATTENTION" VARCHAR2(500) NOT NULL ENABLE,
CONSTRAINT "ASSESSMENT_ANNOUNCEMENT_PK" PRIMARY KEY ("ASSESSMENT_NAME") ENABLE
)
The trigger I have:
CREATE OR REPLACE TRIGGER "TEST"
AFTER INSERT OR UPDATE OR DELETE
ON ASSESSMENT
FOR EACH ROW
BEGIN
IF :new.DEADLINE_DATE >= SYSDATE - 7
THEN
INSERT INTO ASSESSMENT_ANNOUNCEMENT(ASSESSMENT_NAME, DEADLINE_DATE ,ATTENTION)
VALUES(:new.ASSESSMENT_NAME, :new.DEADLINE_DATE, 'DEADLINE IS 7 DAYS OR LESS!');
END IF;
END;
Insert works correctly across the tables. But, when I update on the ASSESSMENT table, a new row is
inserted in the ASSESSMENT_ANNOUNCEMENT table - it is not updated.
A delete from the ASSESSMENT table removes the row from ASSESSMENT table but not the entry from
the ASSESSMENT_ANNOUNCEMENT table.
Any help and/or guidance would be fantastic!

Answer 1

If you want to update or delete a row in ASSESSMENT_ANNOUNCEMENT, you should do it explicitly using update or delete statement.
Use the following construction in your trigger:
IF INSERTING THEN
-- actions for inserting
ELSIF UPDATING THEN
-- actions for updating
ELSE
-- actions for deleting
END IF;

Answer 2

Just to give you a complete sample
CREATE OR REPLACE TRIGGER "TEST"
AFTER INSERT OR UPDATE OR DELETE
ON ASSESSMENT
FOR EACH ROW
BEGIN
IF INSERTING THEN
IF :new.DEADLINE_DATE >= SYSDATE - 7
THEN
INSERT INTO ASSESSMENT_ANNOUNCEMENT(ASSESSMENT_NAME, DEADLINE_DATE ,ATTENTION)
VALUES(:new.ASSESSMENT_NAME, :new.DEADLINE_DATE, 'DEADLINE IS 7 DAYS OR LESS!');
END IF;
ELSIF UPDATING THEN
UPDATE ASSESSMENT_ANNOUNCEMENT SET
ASSESSMENT_NAME=:new.ASSESSMENT_NAME,
DEADLINE_DATE=:new.DEADLINE_DATE,
ATTENTION='Deadline Updated'
WHERE ASSESSMENT_NAME=:old.ASSESSMENT_NAME;
ELSE
DELETE ASSESSMENT_ANNOUNCEMENT
WHERE ASSESSMENT_NAME=:old.ASSESSMENT_NAME;
END IF;
END;
Depending on your real business logic and size of PL/SQL code, it may be more clear to create three triggers
CREATE OR REPLACE TRIGGER "TEST_AI_TRG" AFTER INSERT ON ASSESSMENT ...
CREATE OR REPLACE TRIGGER "TEST_AU_TRG" AFTER UPDATE ON ASSESSMENT ...
CREATE OR REPLACE TRIGGER "TEST_AD_TRG" AFTER DELETE ON ASSESSMENT ...