如何合併這些SQL查詢

Question

我需要合併這個查詢

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' 

與

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語法是新的我，所以我需要這方面的幫助不大，THX

Answer 1

看起來這應該是你的解決方案。

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' 

雖然我強烈建議學習一般的SQL語法。在MySQL tutorials

Answer 2

SELECT CONCAT(c.firstname, ' ', c.lastname) 
,  wc.provincia_id 
,  o.* 
FROM wwwpser_order o 
LEFT JOIN 
     wwwpser_customer c 
ON  c.customer_id = o.customer_id 
LEFT JOIN 
     wwwpser_comuna wc 
ON  wc.comuna_id = o.payment_city 
WHERE o.order_id = 20