SQL SELECT查詢

Question

我有3個表：

users: 

uid int(11) - userid(primary key, auto_increment) 
name varchar(255) 
pass varchar(64) 
created int(11) 

projects: 

pid int(11) ..... 
name varchar(150) 
description varchar(255) 
created int(11) 

users_projects: 

uid int(11) - user id 
pid int(11) - product id 

什麼是查詢：通過顯示名稱與特定名稱的用戶排序的項目（名稱和說明）？

這是我到目前爲止有：

SEECT name,description FROM projects ORDER BY name ASC 

Answer 1

SELECT a.*, b.* 
FROM users a 
     INNER JOIN users_projects b 
      ON a.uid = b.uid 
     INNER JOIN projects c 
      ON b.pid = c.pid 
ORDER BY a.Name ASC 

爲了進一步獲得更多的知識有關加入，請訪問以下鏈接：

• Visual Representation of SQL Joins

Answer 2

看起來你只需要加入表格。這裏@Name是一個參數，包含用戶的名字，你想要項目的詳細信息：

SELECT projects.Name, 
     projects.Description 
FROM projects 
     INNER JOIN users_projects 
     ON projects.pid = users_projects.pid 
     INNER JOIN Users 
     ON users_projects.UId = Users.UId 
WHERE Users.Name = @Name 
ORDER BY projects.Name ASC