Question

我对此答案Is there a simpler way to achieve this style of user messaging?

的设置非常相似

但是我在获取未读的总会话时遇到问题，而不是未读的消息。

SELECT p.conversation_id, COUNT(p.conversation_id) as unread
FROM participation AS p
INNER JOIN messages AS m
    ON m.conversation_id = p.conversation_id AND m.seen = 0
WHERE p.uid1 = {$user->data['id']}
GROUP BY m.conversation_id`

我只是选择p.conversation_id进行测试，但我得到的结果是：

Array
(
    [conversation_id] => 1
    [unread] => 77
)

如果我将结果放在PHP while循环中，我会得到

Array
(
    [conversation_id] => 1
    [unread] => 77
)

Array
(
    [conversation_id] => 3
    [unread] => 7
)

Array
(
    [conversation_id] => 8
    [unread] => 1
)

Array
(
    [conversation_id] => 17
    [unread] => 35
)

Array
(
    [conversation_id] => 22
    [unread] => 2
)

Array
(
    [conversation_id] => 24
    [unread] => 305
)

Array
(
    [conversation_id] => 29
    [unread] => 41
)

Array
(
    [conversation_id] => 31
    [unread] => 1
)

我想要的结果是未读的：8

Answer 1

我认为你只想要条件聚合：

SELECT p.conversation_id,
       SUM(m.seen = 0) as unseen, 
       SUM(m.seen <> 0) as seen
FROM participation AS p INNER JOIN
     messages AS m
     ON m.conversation_id = p.conversation_id AND m.seen = 0
WHERE p.uid1 = {$user->data['id']}
GROUP BY m.conversation_id

此外，如果您想要所有会话的总数，请忽略group by。

未读计数和分组

1 个答案: