SQL union two complex query - sql

Question

There are 4 tables,
posts(id
post_share(shared_by, post_id
friendship(friend_one, friend_two, status)
add_viewer(id
By using above 4 tables I need to get posts to render in the user's news feed. Currently I only use the first query to do that which means I do not add shared post by user's friends to his/her news feed. Now I need to show the shared post, too just like in facebook.
For that I created new query ( 2nd one ). Now I want to connect both of them together and result only one table or I would like to know if there's a better way to handle this
By assuming currently logged in user_id is 22,
SELECT concat(a.fname, ' ', a.lname) as name, a.id as user_id , p.id as post_id, p.content, p.media FROM posts p
INNER JOIN add_viewers a
ON p.user_id = a.id
WHERE p.user_id in (
SELECT a.id FROM friendships f
INNER JOIN add_viewers a
ON f.friend_one = a.id OR f.friend_two = a.id
WHERE friend_one=22 OR friend_two=22 AND f.status='confirmed'
GROUP BY a.id
)
ORDER BY created_at DESC
LIMIT 10
OFFSET 0
in 2nd query, s.shared_by means the person who share the post and p.user_id means the person who created the post.
SELECT concat(a.fname, ' ', a.lname) as name, a.id as user_id , p.id as post_id, p.content, p.media FROM post_shares s
INNER JOIN posts p
ON p.id = s.post_id
INNER JOIN add_viewers a
ON p.user_id = a.id
WHERE s.shared_by in (
SELECT a.id FROM friendships f
INNER JOIN add_viewers a
ON f.friend_one = a.id OR f.friend_two = a.id
WHERE friend_one=22 OR friend_two=22 AND f.status='confirmed'
GROUP BY a.id
)
ORDER BY created_at DESC
LIMIT 10
OFFSET 0

Answer 1

Try this
With t as
(SELECT a.id as aid FROM friendships f
INNER JOIN add_viewers a
ON f.friend_one = a.id OR
f.friend_two = a.id
WHERE friend_one=22 OR
friend_two=22 AND
f.status='confirmed'
GROUP BY a.id)
SELECT concat(a.fname, ' ', a.lname) as name, a.id as user_id , p.id as post_id, p.content, p.media FROM
post_shares s
INNER JOIN posts p
ON p.id = s.post_id
INNER JOIN t
ON p.user_id = t.aid
OR s.shared_by = t.aid
ORDER BY created_at DESC
LIMIT 10
OFFSET 0