Check this query:
SELECT t.queue_id,
q.name,
trunc(t.create_time),
count(t.create_time) createcount,
trunc(t.close_time),
count(t.close_time) closedcount,
FROM APP_ACCOUNT.OTRS_TICKET t
LEFT JOIN APP_ACOUNT.OTRS_QUEUE q
ON t.queue_id = q.id
WHERE t.CREATE_TIME BETWEEN SYSDATE -7 AND SYSDATE
GROUP BY trunc(t.create_time), t.queue_id, q.name, trunc(t.close_time);
If this doesn't solves your problem then give the details of both tables and some sample data because I created this query on various assumptions.