Question

如此简单，却又如此困难。我有一个工作正常的查询，但现在我需要进一步扩展它。

目前，查询将输出用户状态更新到网站以及其他信息，例如谁写了状态等。

现在，如果该用户已被阻止（如果它们出现在我的tbl_blocking中），我需要修改代码以不输出用户状态

我完全陷入困境，并且花费了最后这么多时间。

我需要说，
“如果tbl_blocking.user =：谁和tbl_blocking.blocking！=：谁，不输出那个结果”
换句话说，如果登录的人（：谁）阻止某人，则不要显示他们的状态。

    //Get status results
                $sql = "SELECT 

                tbl_status.id as statID, 
                tbl_status.from_user as statFROM, 
                tbl_status.status as statSTATUS, 
                tbl_status.deleted as statDEL, 
                tbl_status.date as statDATE,

                tbl_users.id as usrID, 
                tbl_users.name as usrNAME,
                tbl_users.location as usrLOCATION,
                tbl_users.postcode as usrPOSTCODE,

                tbl_blocking.id as blockID,
                tbl_blocking.user as blockUSER,
                tbl_blocking.blocking as blockBLOCKING,
                tbl_blocking.date as blockDATE,
                tbl_blocking.active as blockACTIVE,

                tbl_photos.profile as photosPROFILE,
                tbl_photos.photo_link as photoLINK,
                tbl_photos.default_photo as photoDEFAULT

                FROM tbl_status 

                LEFT JOIN tbl_users ON tbl_status.from_user = tbl_users.id
LEFT JOIN tbl_blocking ON tbl_status.from_user = tbl_users.id
                LEFT JOIN tbl_photos ON tbl_photos.profile = tbl_users.id 

                WHERE tbl_status.deleted = '0' AND (tbl_photos.default_photo IS NULL OR tbl_photos.default_photo = '1')
    AND (tbl_blocking.user = :who AND tbl_blocking.blocking !=who) OR IS NULL
                ORDER BY tbl_status.date desc

                    ";

Answer 1

实现此目的的一种方法是对ON使用tbl_blocking以下的LEFT JOIN tbl_blocking ON tbl_blocking.blocking = tbl_status.from_user AND tbl_blocking.user = :who子句（这似乎是开头的）：

 WHERE ....
    AND tbl_blocking.id IS NULL

然后包括以下WHERE子句：

{{1}}

我的查询有效，但我很难通过合并另一个表来扩展它

1 个答案: