mysql - SQL 选择查询

Question

我有 3 张桌子：

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

查询是什么：为具有特定名称的用户显示按名称排序的项目（名称和描述）？

这是我到目前为止所得到的：

SEECT name,description FROM projects ORDER BY name ASC

Answer 1

看起来你只需要加入表格。这@Name是一个包含您想要项目详细信息的用户名的参数：

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

Answer 2

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

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• SQL 连接的可视化表示