PHP的MySQL查询工作不正常

Question

我有一个表名tblnetworkstatus，我有11列

1. 编号
2. issue_name
3. affected_server
4. affected_service
5. ISSUE_TYPE
6. 优先
7. 持续时间
8. 状态
9. 起始日期
10. END_DATE
11. 描述

我在affected_server越来越ID和affected_service，我在我的数据库正在存储，现在我有三种情况

1. 要么都有， affected_server和affected_service已被选中
2. 只选择了affected_server
3. 只有affected_service选择

我正在从分别使用连接在三个表tblnetworkstatus，tblserver和tblproduct我已经下面的查询从这里

SELECT 
    m.issue_name ,m.issue_type , 
    m.priority ,m.status,m.description , 
    m.start_date,m.end_date,m.duration, 
    s.name as server_name,p.name as product_name 
    from mod_networkstatus as m 
    LEFT JOIN tblservers as s ON m.affected_server=s.id 
    LEFT JOIN tblproducts as p ON m.affected_service=p.id 

了tblserver和tblproducts affected_server和affected_service的名字

但是，如果我有受影响的服务器和affected_service的多个id，就像我将1,2,3,4存储在单个列affected_server或affected_service那么我该怎么做？

Answer 1

无需使用union，因为它会给很多重复数据

要实现可以通过简单的left join或inner join

SELECT 
    m.issue_name ,m.issue_type , 
    m.priority ,m.status,m.description , 
    m.start_date,m.end_date,m.duration, 
    s.name as server_name,p.name as product_name 
    from mod_networkstatus as m 
    LEFT JOIN tblservers as s ON m.affected_server=s.id 
    LEFT JOIN tblproducts as p ON m.affected_service=p.id 

---

用于做什么一列中有多个ID

SELECT 
    m.issue_name ,m.issue_type , 
    m.priority ,m.status,m.description , 
    m.start_date,m.end_date,m.duration, 
    s.name as server_name,p.name as product_name 
    from mod_networkstatus as m 
    LEFT JOIN tblservers as s ON FIND_IN_SET(m.affected_server,s.id) 
    LEFT JOIN tblproducts as p ON m.affected_service=p.id 

看看这是否适合你。

Answer 2

即使您的要求不是很清楚，仍按照您的要求，您可以使用下面的查询。

SELECT m.issue_name ,m.issue_type ,m.priority ,m.status,m.description ,m.start_date,m.end_date,m.duration,s.name AS server_name,p.name AS product_name 
FROM tblnetworkstatus m 
LEFT JOIN tblservers s ON m.affected_server=s.id 
LEFT JOIN tblproducts p ON m.affected_service=p.id 
WHERE ((m.affected_server='Y' AND m.affected_service='Y') OR m.affected_server='Y' OR m.affected_service='Y'); 

注：如果不是你想要的，那么请共享所有3个表样本数据和所需输出，这样我可以帮助你。

根据您的最新更新，您可以尝试它 -

SELECT m.issue_name ,m.issue_type ,m.priority ,m.status,m.description ,m.start_date,m.end_date,m.duration,s.name AS server_name,p.name AS product_name 
FROM tblnetworkstatus m 
LEFT JOIN tblservers s ON find_in_set(s.id,m.affected_server) 
LEFT JOIN tblproducts p ON find_in_set(p.id,m.affected_service) 
WHERE ((m.affected_server='Y' AND m.affected_service='Y') OR m.affected_server='Y' OR m.affected_service='Y'); 

注：但是，这不是一个好主意，因为它不会使用索引和缓慢的过程。