MySQL: Count the distinct rows per day

Here's how you'd get counts per day for the last 7 days:

select
    count(*) as count,
    date(timestamp) as date
from
    tablename
where
    timestamp >= date_sub(curdate(), interval 7 day)
group by 
    date;

+-------------+------------+
| count       | date       |
+-------------+------------+
| #forThatDay | 2020-02-21 |
| #forThatDay | 2020-02-22 |
| #forThatDay | 2020-02-22 |
| #forThatDay | 2020-02-23 |
| #forThatDay | 2020-02-24 |
| #forThatDay | 2020-02-25 |
| #forThatDay | 2020-02-26 |
+-------------+------------+
7 rows in set (0.03 sec)

group by the ipNum column first to get distinct counts of that column per day:

select
    count(*) as count,
    date(timestamp) as date
from
    tablename
where
    timestamp >= date_sub(curdate(), interval 7 day)
group by 
    ipNum, date;

SELECT  DATE(timestamp) Date, COUNT(DISTINCT ipNum) totalCOunt
FROM    tableName
GROUP   BY  DATE(timestamp)

• SQLFiddle Demo