MySQL show empty records when no match

Question

I have a query with some LEFT JOIN's. I am trying to make one of them show the NULL matches when one clause is not matched.

SELECT *, sr.id as role_id, ss.id as scheduled_entry_id
FROM T_STAFF_ROLE AS sr
LEFT JOIN T_STAFF_SCHEDULE AS ss
ON sr.id = ss.staff_role_id
LEFT JOIN T_BOOKINGS_ADMIN AS ba
ON ba.id = ss.admin_user_id
AND ss.client_booking_id='12495' // unreal id
ORDER BY sr.id 

I would like to always show the T_STAFF_ROLE entries.
If there is a match here ss.client_booking_id=".$id_booking.' show that, otherwise return the field with NULL values.

I tried with AND (as it is now), but then I get all results with other ss.client_booking_id also.

Tried with WHERE but then I don'r get anything if there is no match. I would like to still get one entry per row on sr. I thought that was the point with the "LEFT" JOIN

Where is my logic or code wrong?

My rendered query:

SELECT *, sr.id as role_id, ss.id as scheduled_entry_id 
FROM staff_role AS sr 
LEFT JOIN staff_schedule AS ss ON sr.id = ss.staff_role_id 
LEFT JOIN admin_users AS ba ON ba.id = ss.admin_user_id 
AND ss.client_booking_id=336 ORDER BY sr.id

My sr has 9 rows, it's fixed. Different roles like taxi, cleaner, tourist guide. The ss is bookings of a certain role/person. I use this query on PHP to generate HTML, and would like it to generate data for all the "roles" in case some of them is not matched.

Answer 1

The condition AND ss.client_booking_id=".$id_booking.' is in the wrong place. It should be part of the join with T_STAFF_SCHEDULE. In your current query, you get all T_STAFF_SCHEDULE that match sr.id, and all T_BOOKINGS_ADMIN when any of its parent T_STAFF_SCHEDULE matches $id_booking.

Well, I don't know the meaning of every column and table, but I think it should look like this:

 "SELECT *, sr.id as role_id, ss.id as scheduled_entry_id
    FROM ".T_STAFF_ROLE." AS sr
    LEFT JOIN ".T_STAFF_SCHEDULE." AS ss
    ON sr.id = ss.staff_role_id
    AND ss.client_booking_id=".$id_booking."
    LEFT JOIN ".T_BOOKINGS_ADMIN." AS ba
    ON ba.id = ss.admin_user_id
    ORDER BY sr.id";