SQL加入不同的表

Question

之間，我有4個表：

• 客戶
• 賬戶
• 付款
• 轉會

我想這使得無論是傳輸或客戶付款。付款表與客戶表相關聯，轉賬表與客戶表相關聯，而客戶表與客戶表相關聯。

我怎麼能寫一個返回做出任何支付或轉移客戶查詢？

SELECT customer.registration_os, Count(DISTINCT customer.customer_id) AS registrations 
FROM customer 
Inner Join account On customer.customer_id = account.customer_id 
INNER JOIN payment ON customer.customer_id = payment.customer_id 
LEFT JOIN transfer ON customer.customer_id= transfer.from_account 
WHERE customer.ts_created BETWEEN ? AND ? 
    AND customer.registration_source = ? 
GROUP BY customer.registration_os 

謝謝

Answer 1

SELECT * FROM Customers as t1 
LEFT JOIN Accounts as t2 ON t2.customer_id = t1.id // (Account table is linked to Customers) 
LEFT JOIN Payments as t3 ON t3.customer_id = t3.id // (Payments table is linked to Customers) 
LEFT JOIN Transfers as t4 ON t4.account_id = t2.id // (Transfers table is linked to Accounts) 
WHERE (condition) 

對於病症使用的參數基礎上表名在這裏，我給T1，T2，T3，T4你可以使用任何表中的條件。

Answer 2

我想這使得無論是轉賬或付款的客戶

在SQL中，UNION類似於邏輯OR：

SELECT customer_id 
    FROM customer NATURAL JOIN account 
    UNION 
    SELECT customer_id 
    FROM customer NATURAL JOIN (SELECT from_account AS customer_id 
            FROM transfer) t