Question

我在确定如何进行查询以实现以下情况时遇到了一些麻烦。我希望用户能够查看他们的事件和活动（两个不同的表），以及他们所属的组织的任何事件/活动按日期排序

活动表

eventID |  eventTitle   | eventBy   | eventDate
1           Event 1        1          2012/10/11
2           Event 2        2          2012/10/08
3           Event 3        3          2012/10/05

活动表

postID     |   postTitle  |  postBy  |    postDate
  1            activity 1       1          2012/10/07
  2            activity 2       2          2012/10/09

orgMembers表

orgID  |  userID
 2             1            //userID 1 is a member of groupID 2

无论如何，如果用户ID 1正在查看页面，我正试图让结果看起来如下

 Title            By            Date
Activity 1        1          2012/10/07
Event 2           2          2012/10/08
Activity 2        2          2012/10/09
Event 1           1          2012/10/11

此查询仅会显示我的帖子，而不是我所属的组织。

select eventTitle as title, eventID as ids, eventBy as byUser, users.username, eventDate as date from events
inner join users on users.userid = events.eventBy
where eventBy in (select distinct g1.userID from orgMembers g1
                 inner join orgMembers g2 on g1.orgID = g2.orgID
                 where g2.userID = '$id') 
                 or eventBy = '$id' 

UNION 

select postTitle as description, postID as ids, postBy as byUser, users.username, postDate as date from posts
inner join users on users.userid = posts.postBy
where postBy in (SELECT distinct g1.userID FROM orgMembers g1
                 inner join orgMembers g2 on g1.orgID = g2.orgID
                 where g2.userID = '$id') 
                 or postBy = '$id'

Order BY date"

Answer 1

使用

WHERE eventby IN

将1替换为您的用户ID

您可能希望使用UNION从2个表事件和活动中进行选择

（选择eventInfo为Ttile，eventBy为By，eventDate为Event，其中Eventby为Date（SELECT userid FROM groups WHERE groupid =（SELECT groupid FROM groups WHERE userid = 1）））联盟（选择activityInfo为Ttile，activityInfo为By，activityDate为活动中的日期，其中activityBy in（SELECT userid FROM groups WHERE groupid =（SELECT groupid FROM groups WHERE userid = 1）））订单截止日期

对活动以及do union和sort

执行相同的操作

Answer 2

OR eventBy = 1 如果一个用户可以“无组”，则必须添加OR activityBy = 1。如果所有用户都至少有一个组，则可以将其删除

SELECT eventInfo as title, eventBy as By, eventDate as Date
FROM event
WHERE eventBy IN (select distinct g1.userId from groups g1
                   inner join groups g2 on g1.groupId = g2.groupId
                   where g2.userId = 1)
OR eventBy = 1 

UNION
SELECT activityInfo as title, activityBy as By, activityDate as Date
FROM Activity
WHERE activityBy = (select distinct g1.userId from groups g1
                   inner join groups g2 on g1.groupId = g2.groupId
                   where g2.userId = 1)
OR activityBy = 1

MySQL使用PHP查询多个用户和多个表

2 个答案: