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如何 select 使用 MYSQL 來自不同表的多行

[英]How to select multiple rows from different tables using MYSQL

我有 4 張桌子。 table1中,我想 select postIDstatusdata table2 2 中,我想 select 的postIDstatusupdate table1 和 table2 共享 2 列,即postIDuserID
表 3 有一個表 2 和表 2 共有的postID列。
我想根據用戶表中的userID從table1和table2中查詢數據,然后使用postID從table3中查詢數據。

    $sql = "((SELECT `postID`, `status`, `data`
    FROM `table1`
    LEFT JOIN `users` 
    ON users.user_id=table1.userID 
    WHERE table1.userID=:userID 
    AND table1.active=:active)
    UNION 
    (SELECT `postID`, `status`, `update`
    FROM `table2`
    LEFT JOIN `users` 
    ON users.user_id=table2.userID 
    WHERE table2.userID=:userID 
    AND table2.active=:active
    ORDER BY table1.postID DESC))
    AS tab12
    LEFT JOIN `table3`
    ON table3.postID=:tab12.postID
    WHERE table3.active=:active";
    $stmt = $this->pdo->prepare($sql);
        $stmt->bindValue(":userID", $userID, PDO::PARAM_INT);
        $stmt->bindValue(":active", $active, PDO::PARAM_INT);
        $stmt->execute();

如何將 go 到 table3 和 select 僅一些列:status、update、timeDate,然后將結果關聯到前面的查詢?
就像是:

    $sql = "SELECT `status`, `update`, `timeDate` 
    FROM `table3` 
    WHERE postID=:tab12.postID
    AND active=:active";
    $stmt = $this->pdo->prepare($sql);
        $stmt->bindValue(":postID", $postID, PDO::PARAM_INT);
        $stmt->bindValue(":active", $active, PDO::PARAM_INT);
        $stmt->execute();
Select result.PostID, result.Status, result.data, T2.Status,                 
result.update, user.status, user.update, user.timeDate
from (Select T1.PostID, T1.Status, T1.data, T2.Status, T2.update
from table1 as t1
union table2 as T2
where T1.UserID = T2.UserID) result
union user 
where result.PostID = User.PostID

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