Question

I need to merge this query

SELECT 
*,
(SELECT 
        CONCAT(c.firstname, ' ', c.lastname)
    FROM
        wwwpser_customer c
    WHERE
        c.customer_id = o.customer_id) AS customer
FROM
wwwpser_order o
WHERE
o.order_id = '20'

with

SELECT 
orders . *, wwwpser_comuna.provincia_id AS payment_provincia_id
FROM
wwwpser_order orders
    LEFT JOIN
wwwpser_comuna ON (orders.payment_city = wwwpser_comuna.comuna_id) 

SQL syntax is new for me so I need a little help with this, thx

Answer 1

It looks like this should be your solution.

SELECT 
o.*,                                                -- modified (qualified the
(SELECT                                             -- asterisk)
        CONCAT(c.firstname, ' ', c.lastname)
    FROM
        wwwpser_customer c
    WHERE
        c.customer_id = o.customer_id) AS customer, 
c.provincia_id AS payment_provincia_id              -- added from second query
FROM
wwwpser_order o
    LEFT JOIN                                       -- added from second query
wwwpser_comuna c ON (o.payment_city = c.comuna_id)  -- added from second query
WHERE
o.order_id = '20'

I strongly recommend learning about the general SQL syntax, though. There are some useful examples in the MySQL tutorials