Question

Having a problem combining 2 JOINS. Both statements below work. I have also included the relevant fields in the 2 DBs. My question is:
1) How do I combine the 2 statements into 1 statement?
2) How do I reference the rows in my php to distinguish if the result was from the mmpreID JOIN or the mmparID JOIN?

Thanks

DB: matchmaker
mmpreID
mmparID

DB: users
uID
ufname
ulname

SELECT matchmaker.mmpreID, matchmaker.mmparID, users.uID, users.ufname, users.ulname 
FROM matchmaker 
LEFT JOIN users ON matchmaker.mmparID = users.uID

SELECT matchmaker.mmpreID, matchmaker.mmparID, users.uID, users.ufname, users.ulname 
FROM matchmaker 
LEFT JOIN users ON matchmaker.mmpreID = users.uID

Answer 1

SELECT m.mmpreID, m.mmparID, u.uID, u.ufname, u.ulname,
    case 
        when m.mmparID = u.uID then 'mmparID'
        when m.mmpreID = u.uID then 'mmpreID'
        else null 
    end as Source
FROM matchmaker m
LEFT JOIN users u ON m.mmparID = u.uID or m.mmpreID = u.uID 

Update:

SELECT m.mmpreID, m.mmparID,
    upar.uID as upar_UID, 
    upar.ufname as upar_UFNAME, 
    upar.ulname as upar_ULNAME,
    upre.uID as upre_UID, 
    upre.ufname as upre_UFNAME, 
    upre.ulname as upre_ULNAME
FROM matchmaker m
LEFT JOIN users upar ON m.mmparID = upar.uID 
LEFT JOIN users upre ON m.mmpreID = upre.uID