包含有关成员信息的表格具有以下结构:
id | fname | pic | status
--------------------------------------------------
1 | john | a.jpg | 1
2 | mike | b.jpg | 1
3 | any | c.jpg | 1
4 | jacky | d.jpg | 1
朋友列表的表格如下:
myid | date | user
-------------------------------
1 | 01-01-2011 | 4
2 | 04-01-2011 | 3
我想进行一个查询,结果打印来自“friendlist”表的用户,其中包含来自myid(添加者)和用户(添加者)的“成员”表中的用户的照片和名称
此示例中的表格如下所示:
myid | myidname | myidpic | user | username | userpic | status
-----------------------------------------------------------------------------------
1 | john | a.jpg | 4 | jacky | d.jpg | 1
2 | mike | b.jpg | 3 | any | c.jpg | 1
答案 0 :(得分:1)
这应该这样做:
SELECT
m1.id AS myid,
m1.fname AS myidname,
m1.pic AS myidpic,
m2.id AS user,
m2.fname AS username,
m2.pic AS userpic,
m1.status
FROM
members m1
INNER JOIN friends f ON m1.id = f.myid
INNER JOIN members m2 ON f.user = m2.id