Question

我想访问MySQL中子查询中的字段，但是我收到一个未知列'var_customer_id' in 'on clause'错误。这是我的代码：

SELECT *,
        CONCAT(customer_phone_1, ', ', customer_phone_2) AS customer_phone,
        CONCAT(customer_fax_1, ', ', customer_fax_2) AS customer_fax,
        CONCAT(customer_email_1, ', ', customer_email_2) AS customer_email,
        tbl_customer.customer_id AS var_customer_id,                
        (
            SELECT
                GROUP_CONCAT(tbl_service.service_name SEPARATOR ', ')
            FROM
                kuesioner_bbia.tbl_customer_service
                INNER JOIN kuesioner_bbia.tbl_service 
                ON (tbl_customer_service.service_id = tbl_service.service_id )
                AND tbl_customer_service.customer_id=var_customer_id                    
            GROUP BY tbl_customer_service.customer_id                   
            )               

        FROM tbl_customer
        ORDER BY customer_id ASC

那么如何解决呢？抱歉我的英文。

Answer 1

错误在于：

ON (tbl_customer_service.service_id = tbl_service.service_id )
                AND tbl_customer_service.customer_id=var_customer_id

可以是以下内容（注意：我将var_customer_id替换为tbl_customer.customer_id）：

ON (tbl_customer_service.service_id = tbl_service.service_id )
WHERE tbl_customer_service.customer_id = tbl_customer.customer_id

OR（重新定位右括号）：

ON (tbl_customer_service.service_id = tbl_service.service_id 
AND tbl_customer_service.customer_id = tbl_customer.customer_id)

on子句MySQL中的未知列

1 个答案: