Conditionally counting while also grouping by - mysql

Question

I am trying to join two tables
ad_data_grouped
adID, adDate (date), totalViews
This is data that has already been grouped by both adID and adDate.
The second table is
leads
leadID, DateOfBirth, adID, state, createdAt(dateTime)
What I'm struggling with is joining these two tables so I can have a column that counts the number of leads when it shares the same adID and where the adDate = createdAt
The problem I'm running into is that when the counts are all the same for all groupings of adID....I have a few other things I'm trying to do, but it's based on similar similar conditional counting.
Query:(I know the temp table is probably overkill, but I'm trying to break this up into small pieces where I can understand what each piece does)
CREATE TEMPORARY TABLE ad_stats_grouped
SELECT * FROM `ad_stats`
LIMIT 0;
INSERT INTO ad_stats_grouped(AdID, adDate, DailyViews)
SELECT
AdID,
adDate,
sum(DailyViews)
FROM `ad_stats`
GROUP BY adID, adDate;
SELECT
ad_stats_grouped.adID,
ad_stats_grouped.adDate,
COUNT(case when ad_stats_grouped.adDate = Date(Leads.CreatedAt) THEN 1 ELSE 0 END)
FROM `ad_stats_grouped` INNER JOIN `LEADS` ON
ad_stats_grouped.adID = Leads.AdID
GROUP BY adID, adDate;

Answer 1

The problem with your original query is the logic in the COUNT(). This aggregate functions takes in account all non-null values, so it counts 0 and 1s. One solution would be to change COUNT() to SUM().
But I think that the query can be furtermore improved by moving the date condition on the date to the on part of a left join:
select
g.adid,
g.addate,
count(l.adid)
from `ad_stats_grouped` g
left join `leads` l
on g.adid = l.adid
and l.createdat >= g.addate
and l.createdat < g.ad_stats + interval 1 day
group by g.adid, g.addate;