从php / mysql中的两个表中删除一条记录

Question

我正在尝试使用以下代码从船表和另一个表中的关联资格中删除“船”：

DELETE FROM tbl_boat, tbl_qualifications 
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

问题是我收到以下错误：

1064-您的SQL语法有误； 在第2行的'WHERE tbl_boat.BT_ID = 113 AND tbl_boat.BT_ID = tbl_ ”附近，查看与您的MySQL服务器版本相对应的手册以使用正确的语法。

感谢对此的任何帮助。

Answer 1

您可能想尝试INNER JOIN。

DELETE FROM tbl_boat
INNER JOIN tbl_qualifications
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

我尚未对此进行测试，但我认为这会起作用。

Answer 2

您必须告诉MySQL这两个表是如何关联的：

DELETE tbl_boat, tbl_qualifications
FROM
    tbl_boat
    INNER JOIN tbl_qualifications USING (BT_ID)
WHERE
    tbl_boat.BT_ID = '$bt_id'

Answer 3

您需要执行两个删除操作：

-首先删除所有关联...
从tbl_qualifications删除，其中BT_ID ='$ bt_id';

-...然后删除船
从tbl_boat删除，其中BT_ID ='$ bt_id';

Answer 4

它应该是

DELETE tbl_boat, tbl_qualifications FROM tbl_boat, tbl_qualifications 
WHERE tbl_boat.BT_ID = '$bt_id' AND tbl_boat.BT_ID = tbl_qualifications.BT_ID;

btw看看如何在MySQL中从多个表中删除？

Answer 5

这肯定会起作用：

DELETE a.*, b.*
FROM tbl_boat AS a
INNER JOIN tbl_qualifications AS b
    ON b.BT_ID = a.BT_ID
WHERE tbl_boat.BT_ID = '$bt_id';

另外，如果BT_ID是INTEGER类型，则从$bt_id周围删除引号。

Answer 6

尝试这个

DELETE uploadfeat,postfeeds,postcomment FROM uploadfeat INNER JOIN postfeeds INNER JOIN postcomment
WHERE uploadfeat.id=postfeeds.postID AND uploadfeat.id=postcomment.postID AND uploadfeat.id=23