MySQL使用PHP查询多个用户和多个表

Question

I'm having a bit of trouble figuring out how to make a query to achieve the following situation. I want a user to be able to view their events and activities (two different tables), along with any events/activities of organizations they belong to sorted by date

Events Table

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

Activities table

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

orgMembers table

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

Anyway, I'm trying to get the results to look be the following if userid 1 is viewing the page

 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

This query results in ONLY my posts only showing, not the organization that I'm a member of too.

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

using

WHERE eventby IN 

replace 1 with your user id

you might want to use UNION to select from 2 tables events and activities

(select eventInfo as Ttile,eventBy as By, eventDate as Date from Events where Eventby in (SELECT userid FROM groups WHERE groupid = (SELECT groupid FROM groups WHERE userid = 1))) UNION (select activityInfo as Ttile,activityInfo as By, activityDate as Date from Activities where activityBy in (SELECT userid FROM groups WHERE groupid = (SELECT groupid FROM groups WHERE userid = 1))) Order BY Date

do the same with activities and the do union and sort

Answer 2

The OR eventBy = 1 and OR activityBy = 1 must be added if one user can be "without group". If all users have at least one group, you can remove them

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