php - 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中删除“船”以及另一个表中的相关资格：

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 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以获取'WHERE tbl_boat.BT_ID = 113 AND tbl_boat.BT_ID = tbl_在第 2 行的 ' 附近使用的正确语法。

感谢您对此的任何帮助。

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;

我还没有测试过这个，但我认为这会奏效。

Answer 2

你必须告诉 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：

-- 首先删除所有关联 ...
DELETE FROM tbl_qualifications WHERE BT_ID = '$bt_id';

-- ... 然后删除船
DELETE FROM tbl_boat WHERE 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;

顺便看看如何从 MySQL 中的多个表中删除？

Answer 5

这肯定会奏效：

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';

此外，如果BT_IDisINTEGER类型，则从 around 中删除引号$bt_id。

Answer 6

试试这个

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