Добавление внутреннего соединения к этому запросу

Question

У меня есть следующий запрос, который я нашел в Интернете его модифицированную версию. У меня есть другая таблица с именем contacts, и я пытаюсь внутренне объединить l.id с c.email. Обычно я не использую подзапросы, поэтому то, что я нашел в Интернете, кажется мне чуждым.

В любом случае, как мне добавить внутреннее соединение, где l.id = c.lead_id, так как мне нужно выбрать c.email.

SELECT l.id, 
(SELECT amount FROM lead_status WHERE lead_id = l.id AND buyer = 'BUYER_PROXY') AS our_bid,
(SELECT amount FROM lead_status WHERE lead_id = l.id AND buyer != 'BUYER_PROXY' AND discriminator='AUTO_PING' ORDER BY amount DESC LIMIT 1) AS best_bid,
(SELECT amount FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) AS final_sold_amount,
(SELECT buyer FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) AS buyer
FROM leads AS l
WHERE l.state = 'ACCEPTED'
AND (SELECT buyer FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) != 'TEST'
AND DATE(l.create_date) > '2011-12-01'

Я знаю, вопрос не ясен, но может кто-нибудь помочь.

Answer 1

Ты действительно близко:

SELECT l.id, 
(SELECT amount FROM lead_status WHERE lead_id = l.id AND buyer = 'BUYER_PROXY') AS our_bid,
(SELECT amount FROM lead_status WHERE lead_id = l.id AND buyer != 'BUYER_PROXY' AND discriminator='AUTO_PING' ORDER BY amount DESC LIMIT 1) AS best_bid,
(SELECT amount FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) AS final_sold_amount,
(SELECT buyer FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) AS buyer,
c.email
FROM leads AS l
INNER JOIN contacts AS c ON l.id = c.lead_id
WHERE l.state = 'ACCEPTED'
AND (SELECT buyer FROM lead_status WHERE lead_id = l.id AND discriminator = 'AUTO_POST' AND winner = 1 ORDER BY amount DESC LIMIT 1) != 'TEST'
AND DATE(l.create_date) > '2011-12-01'

INNER JOIN аналогичен добавлению еще одной таблицы, сначала у вас есть исходная таблица "FROM", а затем INNER JOIN (или варианты) для остальных.