Create array that has data from two tables - mysql

Question

I would like to create a table where all data from "treatment_parameters" is used and where parameter_fk=47. Additionally, the table should also include only the count(*) of rows from "treatment_log" where the missed_treatment=' '.
So the table should project out all data from "treatment_parameters" with parameter_fk=47 and the number of rows in "treatment_log" where missed_treatment=' '.
Should also note that: t.id = l.treatment_fk
I have attempted this, however it is partially successful. The table displays all required data, however it does not display every row from "treatment_paratmers" with parameter_fk=47. (There should be two different rows)
SELECT t.id,t.parameter_fk,t.course_name,t.room, t.protocol,t.navigation,t.area,t.coil,t.number_of_treatments,t.motor_threshold,t.threshold_multiplier,t.target_threshold,t.about,t.date,t.created_at, COUNT(*) AS completed_treatments
FROM treatment_parameters t
LEFT JOIN treatment_log l
ON t.id = l.treatment_fk
WHERE t.parameter_fk = 47
AND l.missed_treatment=' '
Below you can see the result of the above SQL query:
Image 1
However, you can see that when the SQL query is modified, there is more than just one row for paratmer_fk=47
SELECT t.id,t.parameter_fk,t.course_name,t.room, t.protocol,t.navigation,t.area,t.coil,t.number_of_treatments,t.motor_threshold,t.threshold_multiplier,t.target_threshold,t.about,t.date,t.created_at
FROM treatment_parameters t
WHERE t.parameter_fk = 47
Image 2
So we need to show both rows, and also have the count(*) for missed_treatment=' ' effect both rows.
Below you can find the entire list from treatment_log.
treatment_log

Answer 1

So you need to self-join:
SELECT t.id,t.parameter_fk,t.course_name,t.room, t.protocol,t.navigation,t.area,
t.coil,t.number_of_treatments,t.motor_threshold,t.threshold_multiplier,t.target_threshold,
t.about,t.date,t.created_at, aa.t_count AS completed_treatments
FROM treatment_parameters t
left join (select treatment_fk, count(*) as t_count from treatment_log l
where l.missed_treatment=' ' group by treatment_fk) aa on aa.treatment_fk=t.id
WHERE t.parameter_fk = 47