How can I use concat, twice in a row in same php form

[vuohe]

Hi I have a form where is two driver selection drop down box. what I'm trying to do is to show only drivers that use that vehicle type.

in the db there is drivers table and role id from where I'm selecting right drivers to right menus.

Here are the sql statements, they work okay when only one of these are in use but only the first one when I'm putting both queries in to the form (both are working as expected when commenting out the other one but the other one shows nothing when try to use both):

SELECT CONCAT_WS(' ',drivers.Firstname, drivers.Lastname) AS vehicletypedrivers, user_id, user_roles.role_id
FROM user_roles
LEFT JOIN drivers ON user_roles.user_id = drivers.id where user_roles.role_id='2'
OR user_roles.role2_id= '3'
 
//then here is the <select>...</select>
 
SELECT CONCAT_WS(' ',drivers.Firstname,drivers.Lastname) AS vehicletype2drivers, user_id, user_roles.role_id
FROM user_roles
LEFT JOIN drivers ON user_roles.user_id = drivers.id where user_roles.role_id='3'
OR user_roles.role2_id= '2'
 
//then here is the <select>...</select>