在为摄影项目连接 mysql 数据库中的两个表时需要帮助

Question

我正在从事摄影项目，在加入 table 和从 mysql 数据库检索数据时遇到了一些问题。我为这个项目创建了两个 table。一个名为 cm_team 的 table 用于团队成员，另一个名为 cm_events 的 table 用于photography events..假设要拍摄一个事件，我们需要6个人，并且这个人的id存储在cm_eventstable中。

如上图所示。我将 cm_team 成员的 ID 存储在 cm_events table 中。我希望获得团队名称cm_events table 中相应突出显示字段中的成员。非常感谢任何帮助。

例如我想要的输出应该是：而不是 team_lead 标题下的 5，我应该得到对应于 5 的名字，即 Arjun

Answer 1

是这样的吗？（比子查询更干净、更快）

 SELECT 
        `event`.client_name,
        `event`.client_number,
        # some more event cols ..
        `team_lead`.`cm_name` AS `team_lead`,
        `candid_photo`.`cm_name` AS `candid_photo`,
        `candid_video`.`cm_name` AS `candid_video`,
        `traditional_photo`.`cm_name` AS `traditional_photo`,
        `traditional_video`.`cm_name` AS `traditional_video`,
        `helper`.`cm_name` AS `helper`
    FROM cm_events `event`
        JOIN cm_team `team_lead` ON `team_lead`.`cm_code` = `event`.`team_lead`
        JOIN cm_team `candid_photo` ON `candid_photo`.`cm_code` = `event`.`candid_photo`
        JOIN cm_team `candid_video` ON `candid_video`.`cm_code` = `event`.`candid_video`
        JOIN cm_team `traditional_photo` ON `traditional_photo`.`cm_code` = `event`.`traditional_photo`
        JOIN cm_team `traditional_video` ON `traditional_video`.`cm_code` = `event`.`traditional_video`
        JOIN cm_team `helper` ON `helper`.`cm_code` = `event`.`helper`

Answer 2

有子查询

DROP TABLE IF EXISTS T,t1;
CREATE TABLE T (
id int, name varchar(10));
insert into t values
(1     ,   'aaa'),
(2   ,     'bbb');

create table t1 (
id int, team_lead int,team_a int);
insert into t1 values
(1,1,2),
(2,2,2);

select t1.id, (select t.name from t where t.id = t1.team_lead) team_lead,
(select t.name from t where t.id = t1.team_a) team_a
from t1;

+------+-----------+--------+
| id   | team_lead | team_a |
+------+-----------+--------+
|    1 | aaa       | bbb    |
|    2 | bbb       | bbb    |
+------+-----------+--------+
2 rows in set (0.001 sec)

在为摄影项目连接 mysql 数据库中的两个表时需要帮助

Need help in joining two tables from mysql database for a photography project

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