Join 2 Tables with 2 conditions (MySQL and PHP) - php

Question

I have 2 tables: users and prov_spec_search. Am looking for an sql query to join these tables with the following conditions:
users Table:
id | first_name | last_name | activ_status
-------------------------------------------
6 | sudha | dravid | 1
7 | Gokul | menon | 1
13 | sujith | nair | 1
-------------------------------------------
prov_spec_search Table
id | inv_user_id | drafter_id | activ_status
-------------------------------------------
1 | 13 | 7 | 1
2 | 13 | 6 | 1
-------------------------------------------
Expected Result is:
Need to join users and prov_spec_search tables with 2 conditions where
prov_spec_search.inv_user_id = users.id = Name
AND
prov_spec_search.drafter_id = users.id = Drafter name
Result:
Name | Drafter Name | Active
------------------------------------------
sujit nair | Gokul menon | active
sujit nair | sudha dravid | active
I have started with this query:
SELECT
prov_spec_search.id,
prov_spec_search.inv_user_id,
prov_spec_search.drafter_id,
prov_spec_search.activ_status,
users.first_name,
users.last_name,
users.activ_status AS activ_status1
FROM prov_spec_search
INNER JOIN users ON prov_spec_search.inv_user_id = users.id AND prov_spec_search.drafter_id = users.id
WHERE (prov_spec_search.activ_status ='1')

Answer 1

You need to join from the prov_spec_search table to the users table, twice:
SELECT
pss.id,
pss.inv_user_id,
pss.drafter_id,
pss.activ_status,
CONCAT(u1.first_name, ' ', u1.last_name) AS Name,
CONCAT(u2.first_name, ' ', u2.last_name) AS Drafter_Name
FROM prov_spec_search pss
LEFT JOIN users u1
ON pss.inv_user_id = u1.id
LEFT JOIN users u2
ON pss.drafter_id = u2.id
WHERE
pss.activ_status = 1;
-- you may filter user and drafter names here if desired
Demo

Answer 2

You need to join the users table twice: once for the Name and once for the Drafter Name:
SELECT CONCAT(n.first_name, ' ', n.last_name) as Name,
CONCAT(d.first_name, ' ', d.last_name) as Drafter_Name,
p.activ_status as Active
FROM prov_spec_search p
JOIN user n ON p.inv_user_id = n.id
JOIN user d ON p.drafter_id = d.id
WHERE p.activ_status = 1
Note that I assume you get the status Active = 1 from somewhere else, but I'm sure you can add that to the query above without any trouble.