Question

table1 - customer_data

c_id（int）

name（varchar）

table2 - account_data

a_id（int）

c_id（int） - ＆gt;使用customer_data。c_id

plan_id（int）

table3 - game_data

g_id（int）

sort（int）

a_id（int） - ＆gt;使用account_data。a_id

game_name（var）

我使用子查询从account_data中选择game_data。那样：

SELECT `a_id`,`c_id`,`plan_id`,
(SELECT `game_name` FROM `game_data` WHERE `a_id` = a.`a_id` ORDER BY `sort` ASC LIMIT 1) as main_game
FROM `accoubt_data` AS a WHERE `a_id` > 0 ORDER BY `id` DESC

此sql适用于来自game_data

的select account_data

但我无法使用它从game_data

中选择customer_data

我该怎么办？

customer_data
 +----------------------+
 | c_id      | name     |
 +----------------------+
 | 1001      | Joe      |
 | 1002      | John     |
 | 1003      | David    |
 +----------------------+

account_data
 +-------------------------------------+
 | a_id      | cid      |  plan_id     |
 +-------------------------------------+
 | 6015     | 1002     |   34          |
 | 6028     | 1003     |   1           |
 | 6088     | 1001     |   9           |
 +-------------------------------------+

game_data
 +--------------------------------------+
 | g_id     | game_name    |    a_id    |
 +--------------------------------------+
 | 8011     | GTA5         |    6015    |
 | 8023     | WWE2016      |    6028    |
 | 8088     | FIFA16       |    6088    |
 | 8095     | FIFA17       |    6088    |
 | 8086     | FIFA15       |    6088    |
 +--------------------------------------+

这是基础选择

我需要从customer_data.c_id

获取此数据

 +--------------------------------------+
 | c_id   | name     | frist_game       | 
 +--------------------------------------+
 | 1001   |  Joe     | FIFA15           |
 | 1002   |  John    | GTA5             |   
 | 1003   |  David   | WWE2016          |  
 +--------------------------------------+

c_id＆gt; a_id＆gt; g_id ORDER BY sort ASC

Answer 1

尝试加入：

SELECT c.`c_id`,c.name,
       (SELECT `game_name` FROM `game_data` 
        WHERE `a_id` = a.`a_id`
        ORDER BY `sort` ASC LIMIT 1) as first_game
FROM `accoubt_data` a
JOIN customer_data c ON(a.c_id = c.c_id)
WHERE a.`a_id` > 0 
ORDER BY a.`id` DESC

Answer 2

试试这个

SELECT cd.c_id,cd.name, first_game 
FROM account_data ad 
inner join game_data gd ON ad.a_id = gd.a_id order by gd.g_id,ad.a_id as games 
inner join customer_data cd on games.c_id = cd.c_id order by cd.c_id

希望这有效。

在3个表上选择sub sub sql查询

2 个答案: