無效列名稱中使用INNER JOIN從兩個表中

Question

獲取值時，我有兩個表：

tbl_profiles_and_users：

[id] [int] IDENTITY(1,1) NOT NULL, 
[profile_id] [int] NOT NULL, 
[user_id] [nvarchar](50) NULL 

tbl_profiles_and_activities：

[id] [int] IDENTITY(1,1) NOT NULL, 
[profile_id] [int] NOT NULL, 
[user_id] [nvarchar](50) NOT NULL, 
[activity_name] [nvarchar](50) NULL, 
[check] [int] NULL, 
[preferred] [int] NULL 

兩個表中都有條目，我試圖僅在指定的配置文件中選擇用戶和活動。

我試圖用這樣做以下連接：

use [dbName] 

SELECT p1.user_id AS User_ID, [p2.activity_name] as [Activity_Name] 
FROM tbl_profiles_and_users AS p1 
INNER JOIN tbl_profiles_and_activities AS p2 
ON p1.user_id = p2.user_id AND p1.profile_id = p2.profile_id 

，但我收到消息 無效的列名稱p2.activity_name「 什麼我做錯了什麼？我可以通過加入來達到預期效果嗎？

Answer 1

，因爲你在逃避整列，因此，服務器把它讀成[p2.activity_name]爲整個列名是從[p2].[activity_name]

SELECT p1.user_id AS User_ID, [p2].[activity_name] as [Activity_Name] 
FROM ....