Error on executing trigger - sql

Question

CREATE OR REPLACE TRIGGER PROCESS_POPULATE_INSTANCE
AFTER INSERT OR UPDATE ON PROCESS_INSTANCE
FOR EACH ROW
DECLARE
InstanceExists NUMBER;
BEGIN
SELECT COUNT(*)
INTO InstanceExists
FROM TEST_PROCESSDATA
WHERE TEST_PROCESSDATA.PROCESS_INSTANCE_ID = :NEW.INSTANCE_ID ;
IF ( InstanceExists > 0 ) THEN
UPDATE TEST_PROCESSDATA SET PROCESS_STATUS =:NEW.STATUS WHERE PROCESS_INSTANCE_ID = NEW.INSTANCE_ID;
ELSIF
INSERT INTO TEST_PROCESSDATA (PROCESS_INSTANCE_ID,PROCESS_STATUS, STARTED_TIME) VALUES (:NEW.INSTANCE_ID,:NEW.STATUS,:NEW.START_TIME);
END IF;
END PROCESS_POPULATE_APPDATA;
On executing the above trigger, i get the below error:
Error(12,2): PLS-00103: Encountered the symbol "INSERT" when expecting one of the following: ( - + case mod new not null continue avg count current exists max min prior sql
stddev sum variance execute forall merge time timestamp interval
date
pipe
Error(13,2): PLS-00103: Encountered the symbol "END"

Answer 1

In addition to what Ravindra bagale has already noted I would add the following:
First. In the statement
UPDATE TEST_PROCESSDATA SET PROCESS_STATUS =:NEW.STATUS
WHERE PROCESS_INSTANCE_ID = NEW.INSTANCE_ID;
: colon is missing in front of NEW.INSTANCE_ID
And second. You might consider using of merge statement instead of IF .. THEN .. ELSE.. END IF construct and additional select statement. For example.
create or replace trigger process_populate_instance
after insert or update on process_instance
for each row
begin
merge into test_processdata
using dual
on (process_instance_id = :new.instance_id)
when matched
then update
set process_status =:new.status
when not matched
then insert (process_instance_id,process_status, started_time)
values (:new.instance_id,:new.status,:new.start_time);
end;

Answer 2

use ELSE instead of ELSIF
here u used elseif,but not used else, u can't use elseif without else
when there are more than two way then u can use elsif.
IF ( InstanceExists > 0 ) THEN
UPDATE TEST_PROCESSDATA SET PROCESS_STATUS =:NEW.STATUS WHERE PROCESS_INSTANCE_ID = NEW.INSTANCE_ID;
ELSE
INSERT INTO TEST_PROCESSDATA (PROCESS_INSTANCE_ID,PROCESS_STATUS, STARTED_TIME) VALUES (:NEW.INSTANCE_ID,:NEW.STATUS,:NEW.START_TIME);
END IF;
END PROC