SQL中有两个不明确列名的查询错误

我处理这个查询已经有一段时间了，现在我有点困难。我是SQL新手，无法理解为什么会出现错误：

SELECT customer_number, first_name_initial, last_name,serve_address_1, serve_address_2, serve_city, serve_state, route_serve_zip_code, phone_number1, referral_code
FROM customer_master 
INNER JOIN route_detail 
ON m.customer_number=r.customer_number
WHERE (referral_code='american')

错误

Msg 209，16级，状态1，第1行 “客户号”列名称不明确。 Msg 209，16级，状态1，第1行 列名称“phone_number1”不明确

我试着按如下方式添加这些列，但也没有成功。任何帮助都将不胜感激

SELECT customer_number, first_name_initial, last_name,serve_address_1, serve_address_2, serve_city, serve_state, route_serve_zip_code, phone_number1, referral_code
FROM customer_master m
INNER JOIN route_detail r
ON m.customer_number=r.customer_number
WHERE (referral_code='american')

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问题在于这条线

SELECT customer_number

您需要指定要从哪个表中获取客户编号，如下所示：

SELECT r.customer_number

SELECT r.customer_number, --or m.customer_number
first_name_initial, last_name,serve_address_1, serve_address_2, serve_city, serve_state, route_serve_zip_code, phone_number1, referral_code
FROM customer_master 
INNER JOIN route_detail 
ON m.customer_number=r.customer_number
WHERE (referral_code='american')

或

因此，您的最终查询如下所示：

SELECT r.customer_number

SELECT r.customer_number, --or m.customer_number
first_name_initial, last_name,serve_address_1, serve_address_2, serve_city, serve_state, route_serve_zip_code, phone_number1, referral_code
FROM customer_master 
INNER JOIN route_detail 
ON m.customer_number=r.customer_number
WHERE (referral_code='american')

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总是我错过的一件小事。谢谢大家!@彼得森：-欢迎！：）