Question

Here’s a mysql table : friends :

followed INT, <-- The user's id ( the follower is following him )
followedby INT <-- The follower's id

and table updates :

updateid INT,
updatetext TEXT,
updatetime DATETIME
uid INT

A guy with the userid 2 is logged in and want to see the updates of the users he follows.
Right now, he only follows 3 users. To select the updates I can do execute this:

SELECT * FROM updates WHERE ( uid=10 , uid=20 OR uid=30 ) ORDERBY updatetime DESC LIMIT 10

Problems

I want to select the users who are followed by the loggedin user and want to select the updates by those users.
The user can have many friends. Please help.

Answer 1

You can use subquery and IN()

SELECT * 
FROM updates 
WHERE uid IN(SELECT followed FROM friends WHERE followedby = USERS_ID_HERE) 
ORDER BY updatetime DESC LIMIT 10