Question

我有一个表名tblnetworkstatus，我有11列

编号
issue_name
affected_server
affected_service
ISSUE_TYPE
优先
持续时间
状态
起始日期
END_DATE
描述

我在protected_server和affected_service中获取id，我将其存储在我的数据库中，现在我有三种情况

已选择affected_server和affected_service
仅选择affected_server
仅选择affected_service

我分别使用tblnetworkstatus，tblserver和tblproduct上的连接分别从tblserver和tblproducts获取affected_server和affected_service的名称我已经从这里获得了以下查询

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 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

但是如果我有多个来自affected_server和affected_service的id，就像我将1,2,3,4存储在一个列affected_server或affected_service中那么我该怎么做？

Answer 1

无需使用union，因为它会提供大量重复数据

您希望通过简单left join或inner join

完成您想要实现的目标

    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

一列中的多个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

看看这是否适合您。

Answer 2

即使您的要求不是很清楚，仍然可以根据您的要求使用以下查询。

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');

注意：如果不是您想要的，那么请分享所有3个表样本数据和您想要的输出，以便我可以帮助您。

根据您的最新更新，您可以尝试一下 -

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');

注意：但这不是一个好主意，因为它不会使用索引并减慢过程。

Php Mysql查询无法正常工作

2 个答案: