Sql Count is returning all row values - sql

Question

I have two table users and messages. Messages have status type 1 = unread . I want to get users data and latest message and message time. and also count of messages where messages.status = 1
SELECT users.id, users.name,users.gender,users.status,users.image,users.device_id,users.created_at,users.updated_at,
MAX(messages.created_at) as message_at,
messages.user_id, messages.body as message,
(SELECT COUNT(messages.id) WHERE messages.status = 1 and messages.user_id = users.id) as unread
from messages
JOIN users on users.id = messages.user_id OR users.id = messages.to_id
GROUP BY user_id
ORDER BY message_at DESC
Above queries works. But count of unread it returns wrong numbers.
Edits
I changed This query many problems solves like duplication. But still message count is wrong. I don't know. When All the messages.status != 1 its returns 0 as unread. But When there is one and more messages.status = 1 its shows wrong number :(
Here is updated query.
SELECT users.*,messages.body as message,messages.created_at as message_at,messages.type as message_type,
(SELECT COUNT(messages.id) WHERE (messages.status = 1 and users.id = messages.user_id) ) as unread
from users
JOIN (
SELECT messages.*
FROM messages
ORDER BY messages.created_at DESC
)
messages on users.id = messages.user_id OR users.id = messages.to_id
GROUP BY users.id
ORDER BY message_at DESC
Edits 2.
I have two table.
1 - users
2 - messages [user_id = sender id & to_id = receiver id]
Desired Result.
I want to query all users. with latest message from messages ( for this I have to query all messages with user_id=id or to_id=id). Also with count on unread ( for this messages.status=1) messages.

Answer 1

I think It's because of OR operator .In this query you need exactly " JOIN on users.id = messages.user_id", but if You use OR operator this condition will has wrong numbers. I don't find out column "message.to_id". It works without OR:
SELECT users.id,
users.name,users.gender,users.status,users.image,users.device_id,
users.created_at,
users.updated_at,
MAX(messages.created_at) as message_at,
messages.user_id, messages.body as message,
(SELECT COUNT(messages.id) WHERE messages.status = 1 and messages.user_id =
users.id) as unread
from messages
JOIN users on users.id = messages.user_id
GROUP BY user_id
ORDER BY message_at DESC

Answer 2

Use window functions like MAX(), FIRST_VALUE() and SUM():
SELECT DISTINCT u.*,
MAX(m.created_at) OVER (PARTITION BY u.id) AS message_at,
FIRST_VALUE(m.body) OVER (PARTITION BY u.id ORDER BY m.created_at DESC) AS message,
SUM(m.status IS 1) OVER (PARTITION BY u.id) AS unread
FROM users u LEFT JOIN messages m
ON u.id IN (m.user_id, m.to_id)
This returns the number of messages with status = 1 of each user as a sender or receiver.
If you want only the number of messages that the user sent:
SUM(m.status IS 1 AND m.user_id IS u.id ) OVER (PARTITION BY u.id) AS unread
or the number of messages that the user received:
SUM(m.status IS 1 AND m.to_id IS u.id ) OVER (PARTITION BY u.id) AS unread