MySQL TABLE : numbers

+----+-----+------------+
| ID | NUM |   CREATED  |
+----+-----+------------+
| 1  | 11  | 2018-01-01 |
+----+-----+------------+
| 2  | 22  | 2018-02-01 |
+----+-----+------------+
| 3  | 11  | 2018-03-01 |
+----+-----+------------+
| 4  | 44  | 2018-04-01 |
+----+-----+------------+
| 6  | 44  | 2018-04-02 |
+----+-----+------------+
| 5  | 22  | 2018-05-01 |
+----+-----+------------+
@H_502_13@
在此表中,ID是主键. NUM是随机值,CREATED是Date.
My Query:
 
SELECT
  DATE_FORMAT(CREATED,'%Y-%m') AS Month,COUNT(NUM) AS TotalNum,COUNT(DISTINCT(NUM)) AS UniqueNum
FROM
  `numbers`
GROUP BY
  DATE_FORMAT(CREATED,'%Y-%m')
@H_502_13@
Result of My Query:
+---------+----------+-----------+
| Month   | TotalNum | UniqueNum |
+---------+----------+-----------+
| 2018-01 |    1     |     1     |
+---------+----------+-----------+
| 2018-02 |    1     |     1     |
+---------+----------+-----------+
| 2018-03 |    1     |     1     |
+---------+----------+-----------+
| 2018-04 |    2     |     1     |
+---------+----------+-----------+
| 2018-05 |    1     |     1     |
+---------+----------+-----------+
@H_502_13@
But my Expected Result is :
+---------+----------+-----------+
| Month   | TotalNum | UniqueNum |
+---------+----------+-----------+
| 2018-01 |    1     |     1     |
+---------+----------+-----------+
| 2018-02 |    1     |     1     |
+---------+----------+-----------+
| 2018-03 |    1     |     0     |
+---------+----------+-----------+
| 2018-04 |    2     |     1     |
+---------+----------+-----------+
| 2018-05 |    1     |     0     |
+---------+----------+-----------+
@H_502_13@
在2018-03月,UniqueNum的结果应为0.因为NUM 11已存在于2018-01月.也
在2018-05年,UniqueNum的结果应为0.因为NUM 22已存在于2018-02月.
我想找到每个月的唯一编号.如何通过更新我的MySQL查询来获得我期望的结果？请帮忙.