How to extract Cohort analysis in SQL ? or MySQL? - mysql

Question

Looking at other posts was not working due to my lack of ability .
I am trying to extract a Cohort from the date of installation .
information TABLE
u_status
used : created_at , last_login
u_daily_login
SQL　
SET
#targetDate = '2020-07-01';
SELECT
#Datecount := TIMESTAMPDIFF(
DAY,
#targetDate,
DATE_FORMAT(NOW(), '%Y-%m-%d')) -1;
SELECT
dl.df,
COUNT(udl.uMasterId)
FROM
(
SELECT
DATE_FORMAT(
DATE_ADD(
#targetDate,
INTERVAL td.generate_series DAY
),
'%Y-%m-%d'
) AS df
FROM
(
SELECT
0 generate_series
FROM DUAL
WHERE
(#num := 1 -2) * 0
UNION ALL
SELECT
#num := #num +1
FROM
`information_schema`.COLUMNS
WHERE
#num <= #Datecount
) AS td
) AS dl
LEFT JOIN(
SELECT udlt.*
FROM
(
SELECT
*
FROM
u_daily_login
WHERE
DATE >= #targetDate
) AS udlt
INNER JOIN(
/*基準日に登録したユニークユーザー*/ SELECT
*
FROM
(
SELECT
DATE_FORMAT(us.`createdAt`, '%Y-%m-%d') AS cdate,
us.name,
uMasterId
FROM
u_status AS us
WHERE
DATE_FORMAT(us.`createdAt`, '%Y-%m-%d') = #targetDate
) AS noise
GROUP BY
noise.name
) AS uus
ON
uus.uMasterId = udlt.uMasterId
) AS udl
ON
dl.df = udl.date
GROUP BY
dl.df
LIMIT 100;
I got the desired result,　As it is now, I'm typing targetDate manually.
ex. #targetDate = 2020-07-02 , "targetDate = 2020-07-03 ...etc
How can I efficiently extract daily cohorts?