MYSQL GROUP BY LEFT JOIN and COUNT - mysql

Question

I am having a problem grouping and counting items in a MYSQL database with JOIN clause
My two tables are as follows
users table
id | surname | othernames
1 | Doe | John
2 | Doe | Jane
3 | Doe | Mary
subscriptions table
id | user_id | parent_subscription_id
1 | 1 | Null
2 | 2 | 1
3 | 3 | 1
4 | 4 | 2
5 | 5 | 3
6 | 6 | 3
I need to be able to produce a list as follows
Name | Referrals
John Doe | 2
Jane Doe | 1
Mary Doe | 2
In other words,it Is the user in users table with the users.id which matches subscriptions.user_id that has the subscription with subscriptions.id which is a parent subscription to another subscription. That means, if your subscription is referenced by another subscription as its own parent_subscription_id, then that new subscription becomes your referral.
I have tried the following query and it is not giving me the expected results
SELECT users.surname, users.othernames,count('s.parent_subscription_id') as referrals
FROM users
LEFT JOIN subscriptions s ON s.user_id=users.id
group BY parent_subscription_id
I have checked some other questions on SO but I have not been able to find any that solves this type of issue
Thank you

Answer 1

I think that the logic you want is:
select u.surname, u.othernames, count(s.parent_subscription_id) referrals
from subscriptions s
left join subscriptions p on p.id = s.parent_subscription_id
inner join users u on u.id = coalesce(p.user_id, s.user_id)
group by u.id, u.surname, u.othernames
Demo on DB Fiddle:
surname | othernames | referrals
:------ | :--------- | --------:
Doe | John | 2
Doe | Jane | 1
Doe | Mary | 2

Answer 2

You ca use join between users table and select calculated count as:
SELECT
-- Get all users
users.surname,
users.othernames,
IFNULL(reff.cnt, 0) as referrals -- Preset 0 for users have not referrals in joined table
FROM users
-- Join calculation result
LEFT JOIN (
-- Calculate count by user
SELECT parent_subscription_id, COUNT(*) AS cnt
FROM subscriptions
GROUP BY subscriptions.parent_subscription_id
) reff on reff.parent_subscription_id = users.id;

Answer 3

Change group by fields with users.surname, users.othernames
SELECT users.surname, users.othernames,count(s.parent_subscription_id) as referrals
FROM users
LEFT JOIN subscriptions s ON s.user_id=users.id
group BY users.surname, users.othernames

Answer 4

you need to group by id of users table because you need get count for each user and here is your main table is users. try like this.
SELECT users.surname, users.othernames, count('s.parent_subscription_id') as referrals
FROM users
LEFT JOIN subscriptions s ON s.user_id = users.id
group BY users.id

Answer 5

This query eventually gave me the result I have been looking for
SELECT u.surname,u.othernames,s1.id,s1.parent_subscription_id,
s1.refcode, IFNULL(count(s2.parent_subscription_id),0) as referrals
FROM `subscriptions` s1 left join subscriptions s2
on s1.id=s2.parent_subscription_id
LEFT JOIN users u ON u.id=s1.user_id
GROUP by s1.id
Thank you all for your guidance and support on this. I deeply appreciate it