SQL加入不同的表

Question

之间，我有4个表：

• 客户
• 账户
• 付款
• 转会

我想这使得无论是传输或客户付款。付款表与客户表相关联，转账表与客户表相关联，而客户表与客户表相关联。

我怎么能写一个返回做出任何支付或转移客户查询？

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 

谢谢

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) 

对于病症使用的参数基础上表名在这里，我给T1，T2，T3，T4你可以使用任何表中的条件。

Answer 2

我想这使得无论是转账或付款的客户

在SQL中，UNION类似于逻辑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