如何從此數據庫設計中檢索用戶帖子？

Question

下使用mysql

DB設計：

Users: 
- userId 
- userName 

Posts: 
- postId 
- text 

UserPosts (many-many): 
- userId (FK) 
- postId (FK) 

我想要檢索的所有用戶發佈的所有信息。這正是我需要的：

- userName 
- text 

我不太知道如何寫這個查詢。我如何做這3種方式加入？

Answer 1

SELECT 
     u.userName, 
     p.Text 
FROM 
     UserPosts up 
INNER JOIN 
     Users u 
ON 
     u.userID = up.userID 
INNER JOIN 
     Posts p ON p.postID = up.postID 

Answer 2

select Posts.text, 
     Users.userName 
FROM UserPosts 
INNER JOIN Users on UserPosts.userId = Users.userId 
INNER JOIN Posts on UserPosts.postId = Posts.postId 

Answer 3

SELECT userName, text FROM Users,Posts,UserPosts 
WHERE 
UserPosts.userID = Users.userId AND UserPosts.postID = Posts.postID