Find first in where clause MYSQL - mysql

Question

I've googled and searched here and maybe I don't know the exact way to write the question but can't find an answer...
I need to find the sum of credits from click_stats where source = 'reward' for all users who have claimed at least one of the 3 promo codes AND have the total clicks displayed. There are many more than the 3 but simplifed what I need to try to meet posting criteria.
Tables:
+---------------------------------------------+
| click_stats |
+----+---------+--------+--------+------------+
| ID | Credits | Userid | Source | Clicked |
+----+---------+--------+--------+------------+
| 1 | 10 | jon | reward | 1602216005 |
+----+---------+--------+--------+------------+
| 2 | 5 | bob | reward | 1602216504 |
+----+---------+--------+--------+------------+
| 3 | 5 | jon | reward | 1602216137 |
+----+---------+--------+--------+------------+
| 4 | 5 | bob | reward | 1602216138 |
+----+---------+--------+--------+------------+
| 5 | 10 | jon | reward | 1602216139 |
+----+---------+--------+--------+------------+
| 6 | 5 | jon | reward | 1602216140 |
+----+---------+--------+--------+------------+
| 7 | 10 | bob | reward | 1602216150 |
+----+---------+--------+--------+------------+
| 8 | 10 | jon | reward | 1602216150 |
+----+---------+--------+--------+------------+
+----+---------+--------+--------+------------+
| 9 | 10 | sue | reward | 1602216150 |
+----+---------+--------+--------+------------+
+----+---------+--------+--------+------------+
| 10 | 10 | sue | prize | 1602216150 |
+----+---------+--------+--------+------------+
+-----------------------+
| promo_used |
+----+--------+---------+
| id | userid | promoid |
+----+--------+---------+
| 1 | bob | 1 |
+----+--------+---------+
| 2 | bob | 2 |
+----+--------+---------+
| 3 | bob | 3 |
+----+--------+---------+
| 4 | jon | 1 |
+----+--------+---------+
| 5 | jon | 2 |
+----+--------+---------+
+------------------------+
| promo_codes |
+----+----------+--------+
| id | code | reward |
+----+----------+--------+
| 1 | forever1 | 20 |
+----+----------+--------+
| 2 | novgfy1 | 250 |
+----+----------+--------+
| 3 | novgfy2 | 500 |
+----+----------+--------+
My Query:
SELECT
click_stats.userid as Name,
sum(credits) as TotalClicks
FROM click_stats
JOIN promo_used
ON click_stats.userid = promo_used.userid
JOIN promo_codes
ON promo_used.promoid = promo_codes.id
WHERE
click_stats.source = 'reward'
and FROM_UNIXTIME(clicked) > '2020-10-09'
and (promo_codes.name like '%forever%'
or promo_codes.name like 'novgfy%')
group by
Name
having
TotalClicks > 10
Results when I run my query (returning the total number of clicks * number of promo codes used):
+--------------------+
| Results |
+------+-------------+
| Name | TotalClicks |
+------+-------------+
| bob | 60 |
+------+-------------+
| jon | 80 |
+------+-------------+
Results I am wanting (the total number of clicks only):
+--------------------+
| Expected Results |
+------+-------------+
| Name | TotalClicks |
+------+-------------+
| bob | 20 |
+------+-------------+
| jon | 40 |
+------+-------------+
The problem (I suspect) is that it is summing the click_stats every time it finds a match for promo_codes.name. I just need to know if one of them has been used and then return the total clicks for that user.

Answer 1

Don't join click_stats to the other tables because you will multiply the rows that you get by a factor equal to the number of rows of each user in promo_used.
Instead use the operator IN to filter the users:
SELECT Userid, SUM(Credits) TotalClicks
FROM click_stats
WHERE source = 'reward'
AND FROM_UNIXTIME(clicked) > '2020-10-09'
AND Userid IN (
SELECT pu.Userid
FROM promo_used pu INNER JOIN promo_codes pc
ON pc.id = pu.promoid
WHERE pc.code like '%forever%' OR pc.code like 'novgfy%'
)
GROUP BY Userid
HAVING TotalClicks > 10
Or:
SELECT Userid, SUM(Credits) TotalClicks
FROM click_stats
WHERE source = 'reward'
AND FROM_UNIXTIME(clicked) > '2020-10-09'
AND Userid IN (
SELECT pu.Userid FROM promo_used pu
WHERE EXISTS (
SELECT 1 FROM promo_codes pc
WHERE pc.id = pu.promoid AND (pc.code like '%forever%' OR pc.code like 'novgfy%' )
)
)
GROUP BY Userid
HAVING TotalClicks > 10
See the demo.
Results:
> Userid | TotalClicks
> :----- | ----------:
> bob | 20
> jon | 40