mysql比较表

Question

我被困在mysql中的一些表。不知道如何加入三张表中的信息。非常感谢有人能帮助我。谢谢。

---

这是我：

Table1.Users

+----+--------+--------------+ 
| id | name | lastname  | 
+----+--------+--------------+ 
| 1 | Peter | Elk   | 
| 2 | Amy | Lee   | 
| 3 | James | Ride   | 
| 4 | Andrea | Thompson  | 
+----+--------+--------------+ 

Table2.Projects

+-----+-------------+ 
| id | name  | 
+-----+-------------+ 
| 13 | Lmental  | 
| 26 | Comunica | 
| 28 | Ecobalear | 
| 49 | Puigpunyent | 
+-----+-------------+ 

Table3.Users_Projects

+----------+-------------+ 
| id_users | id_projects | 
+----------+-------------+ 
| 1  | 13   | 
| 1  | 28   | 
| 2  | 13   | 
| 2  | 28   | 
| 2  | 49   | 
| 3  | 28   | 
| 3  | 49   | 
| 4  | 49   | 
+----------+-------------+ 

我想打印是这样的：

+--------+--------------+----------------------------------+ 
| name | lastname  | project       | 
+--------+--------------+----------------------------------+ 
| Peter | Elk   | Lmental,Ecobalear    | 
| Amy | Lee   | Lmental,Ecobalear, Puigpunyent | 
| James | Ride   | Ecobalear,Puigounyent   | 
| Andrea | Thompson  | Puigpunyent      | 
+--------+--------------+----------------------------------+ 

Answer 1

喜欢的东西...

SELECT Users.name, Users.lastname, Projects.name 
FROM (Users, Projects, Users_Projects) 
WHERE Users_Projects.id_users=Users.id AND Users_Projects.id_projects=Projects.id 
ORDER BY ... 

...将输出每行一个用户/项目，你会再有用你选择的语言操纵。

试图在SQL中执行级联等操作很容易导致一个非常可怕的查询。