Combining several queries from Wordpress Database

[Matthew Steele]

I need help combining several queries I have created into one query. Below are the individual queries. At the moment I am running them individually and then combining them in Excel.

This is the main query:

SELECT wp_wp_pro_quiz_statistic.statistic_ref_id, sum(wp_wp_pro_quiz_statistic.points) AS TotalPoints, wp_wp_pro_quiz_statistic_ref.quiz_id, wp_wp_pro_quiz_statistic_ref.user_id, wp_wp_pro_quiz_master.name, wp_users.user_email
FROM ((`wp_wp_pro_quiz_statistic` LEFT JOIN `wp_wp_pro_quiz_statistic_ref` ON wp_wp_pro_quiz_statistic.statistic_ref_id = wp_wp_pro_quiz_statistic_ref.statistic_ref_id) LEFT JOIN `wp_wp_pro_quiz_master` ON wp_wp_pro_quiz_statistic_ref.quiz_id = wp_wp_pro_quiz_master.id) LEFT JOIN
wp_users ON wp_wp_pro_quiz_statistic_ref.user_id = wp_users.ID
GROUP BY statistic_ref_id, wp_wp_pro_quiz_statistic_ref.quiz_id, wp_wp_pro_quiz_statistic_ref.user_id, wp_wp_pro_quiz_master.name, wp_users.user_email
ORDER BY wp_wp_pro_quiz_statistic.statistic_ref_id DESC;

The following queries need to be matched up using user_id:

This one gets the users first name:

SELECT wp_usermeta.*
FROM wp_usermeta
WHERE (((wp_usermeta.meta_key)="first_name"))
ORDER BY wp_usermeta.umeta_id DESC;

and this one gets their last name:

SELECT wp_usermeta.*
FROM wp_usermeta
WHERE (((wp_usermeta.meta_key)="last_name"))
ORDER BY wp_usermeta.umeta_id DESC;

and this one gets an invite code used by the user - there is a field called meta_key which value is secure_invite_invitation_code for this invitation code, but here you will see I am filtering out just a specific invite code ("calibre"):

SELECT wp_usermeta.*
FROM wp_usermeta
WHERE (((wp_usermeta.meta_value)="calibre"))
ORDER BY wp_usermeta.umeta_id DESC;

I want these last three queries to be incorporated into the main query - the first one shown above.

I'd appreciate any help anyone can offer.

Many thanks.