mysql> select date(date_joined),count(*) from users
where MONTH(date_joined)=MONTH(now())
and YEAR(date_joined)=YEAR(now())
group by date(date_joined);
+-------------------+----------+
| date(date_joined) | count(*) |
+-------------------+----------+
| 2020-05-01 | 3 |
| 2020-05-04 | 6 |
| 2020-05-05 | 4 |
| 2020-05-06 | 2 |
+-------------------+----------+