在SQL中使用2個不明確的列名查詢錯誤

Question

我現在一直在使用這個查詢，我很難過。 我是SQL新手，我無法理解為什么我收到錯誤：

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')

錯誤

消息209，級別16，狀態1，行1不明確的列名稱'customer_number'。 消息209，級別16，狀態1，行1不明確的列名稱'phone_number1'。

我已嘗試按如下方式添加列，但也沒有運氣。 任何幫助將不勝感激！

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')

Answer 1

問題出在這條線上

SELECT customer_number

您需要指定要從哪個表中獲取customer_number，如下所示：

SELECT r.customer_number

要么

SELECT m.customer_number

所以你的最終查詢看起來像這樣：

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')