SQL查询 - >我将如何从表

Question

我写了下面的查询得到的ID：

SELECT order_id 
FROM oc_order 
WHERE customer_id=7 
    AND order_status_id=5 

这里CUSTOMER_ID 7是硬编码。而不是硬编码，我必须从桌子上得到ID我怎么会得到这个？

表中的每个客户只要在

Answer 1

使用Sub-Query

SELECT order_id 
FROM oc_order 
WHERE customer_id=(select customer_id from customer where ..) 
    AND order_status_id=5 

登录时间更新考虑你有Customer表，其中有新customer_id存储

Answer 2

或者INNER JOIN

SELECT o.order_id 
FROM oc_order o 
INNER JOIN customer c ON c.customer_id = o.customer_id 
AND o.order_status_id = 5 

Answer 3

试试这个

SELECT order_id 
FROM oc_order 
WHERE customer_id in (SELECT customer_id 
         FROM oc_order) 
AND order_status_id=5