Question

假设order_id 4646，4647和4648来自同一客户。

SELECT customer_id FROM orders WHERE order_id IN (4646, 4647, 4648)

结果：

customer_id
2589
2589
2589

每位客户都有gcm_registration_token。

SELECT gcm_registration_token FROM customer_details WHERE customer_id IN (2589, 2589, 2589)

结果：

gcm_registration_token
dyB_PhRHddU:APA91bGAbuxAIlHUmH2XYK0pWM3ON37O_mTF7g...

我希望第二个查询返回具有相同gcm_registration_token的3行。

预期结果：

gcm_registration_token
dyB_PhRHddU:APA91bGAbuxAIlHUmH2XYK0pWM3ON37O_mTF7g...
dyB_PhRHddU:APA91bGAbuxAIlHUmH2XYK0pWM3ON37O_mTF7g...
dyB_PhRHddU:APA91bGAbuxAIlHUmH2XYK0pWM3ON37O_mTF7g...

解决方法是触发每个值的查询。但是，单一查询是否可行。

Answer 1

像这样使用JOIN：

SELECT c.gcm_registration_token 
FROM orders o
JOIN customer_details c ON c.customer_id = o.customer_id
WHERE o.order_id IN (4646, 4647, 4648)

Answer 2

您可以在以下内容中使用parseInt：

SELECT gcm_registration_token 
FROM orders o
INNER JOIN customer_details d ON o.customer_id = d.customer_id
WHERE order_id IN (4646, 4647, 4648)

Answer 3

使用INNER JOIN

SELECT `gcm_registration_token`
FROM `orders` o
INNER JOIN `customer_details` c ON `o`.`customer_id` = `c`.`customer_id`
WHERE `o`.`order_id` IN (4646, 4647, 4648)

Answer 4

authorsTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

此查询会混合客户明细表和订单表，并返回与左表中的where子句匹配的所有值

需要多行具有相同值的IN OPERATOR

4 个答案: