Display null value in record Oracle - sql

Question

I need to display '0' value in Avg Delay Departure table based on STATION in Schedule table.
Here's the Schedule table,
+---------+---------+----------+
| Station | On Time | Schedule |
+---------+---------+----------+
| AMQ | 174 | 202 |
| AMS | 21 | 27 |
| BDJ | 182 | 210 |
| BDO | 56 | 62 |
| BEJ | 59 | 62 |
| BIK | 74 | 93 |
| BKK | 81 | 87 |
| BKS | 73 | 87 |
| BMU | 60 | 60 |
| BOM | 2 | 7 |
| BPN | 413 | 452 |
+---------+---------+----------+
Here's the Avg Delay table,
+---------+---------------------+
| Station | Avg Delay Departure |
+---------+---------------------+
| AMQ | 53.21 |
| AMS | 49.5 |
| BDJ | 60.78 |
| BDO | 67.66 |
| BEJ | 46.33 |
| BIK | 47.53 |
| BKK | 55.5 |
| BKS | 67.56 |
| BOM | 45.2 |
| BPN | 53.81 |
+---------+---------------------+
Pay attention to BMU record in Schedule table. It has 60 schedules and 60 on time so there's no delay. I want to display the BMU record in Avg Delay table with value of '0' for Avg Delay Departure column. My current query don't display that.
Here's the query for Avg Delay table,
SELECT DEPAIRPORT AS STATION, to_number(to_char(trunc(sysdate) + avg(cast(ACTUAL_BLOCKOFF_LC as date) - cast(SCHEDULED_DEPDT_LC as date)), 'sssss'))/60 as DEPAVERAGE
FROM DBODSXML4OPS.XML4OPS
WHERE ACTUAL_BLOCKOFF_LC IS NOT NULL AND SERVICETYPE IN ('J','G') AND (ACTUAL_BLOCKOFF_LC - SCHEDULED_DEPDT_LC)*24*60 > '+000000015 00:00:00.000000000'
AND STATUS IN ('Scheduled') AND
TO_CHAR(SCHEDULED_DEPDT_LC, 'yyyy-mm-dd') BETWEEN '2018-04-14' AND '2018-05-14'
GROUP BY DEPAIRPORT
ORDER BY STATION ASC;