Question

I have a table in which I store followers, I have another table in which I store friendships
Now I have third table which stores stream data.

Its a social network, there are many reasons so I don’t wish to have one table for follower & friendships (Means facebook subscriptions/friends)

Can someone presents a way how should I query streams table to pick activities of both friends & followings ?

Any help would be really appreciated, thank you

Here is simple Database Scheme, its not really like this but almost!

Okay here is database tables schema please,

Followers table.
Row_ID
User_ID
Following_User_ID

Friends Table
Row_ID
User_ID
Friend_ID

Stream Table
Row_ID
User_ID
Contents_ID
Time
Type

Answer 1

What are you looking for is probably best done as two distinct results sets… or a union of the two.

Select "friend" as src, author, post from friends f inner join streams s on s.author = f.id
union
Select "follower" as src, author, post from followers f inner join streams s on s.author = f.id

This is just some pseudo coding but it should give you an idea of how to proceed. Without knowing your database schema, this is the best I can offer.

Edit:

This might be what your looking for then

select user_id, contents_id, time from (
    select user_id, contents_id, time
    from followers f inner join stream s on s.user_id = f.user_id and f.user_id = "username"
union
    select user_id, contents_id, time
    from friends f inner join stream s on s.user_id = f.user_id and f.user_id = "username"
) order by time desc

This will return the data in time order, descending.