使用 INNER JOIN 从两个表中删除数据

Posted 2023-05-09

【中文标题】使用 INNER JOIN 从两个表中删除数据

【英文标题】：Delete data from two tables with INNER JOIN

【发布时间】：2013-12-22 09:54:12

【问题描述】：

我想根据datetime_lastactive 使用一个 SQL 查询从两个表中删除数据，并且如果 IP 地址与您自己的匹配。但是当我尝试以下 SQL 查询时收到此错误消息：

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your mysql server version for the right syntax to use near 'INNER JOIN visitors_main WHERE information_ipaddress = '123.123.123.123' A' at line 2' in ...

DELETE FROM visitors_list
INNER JOIN visitors_main
WHERE information_ipaddress = :ipaddress
AND datetime_lastactive < NOW() - INTERVAL 3 HOUR

表格如下所示：

CREATE TABLE IF NOT EXISTS `visitors_list` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `id_visitor` int(10) DEFAULT '0',
  `id_user` int(10) DEFAULT '0',
  `data_filename` text NOT NULL,
  `data_filename_get` text NOT NULL,
  `data_useragent` text NOT NULL,
  `datetime_lastactive` datetime NOT NULL,
  `information_ipaddress` text NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
)

CREATE TABLE IF NOT EXISTS `visitors_main` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `id_user` int(10) DEFAULT '0',
  `data_coordinates` varchar(25) NOT NULL,
  `datetime_firstvisit` datetime NOT NULL,
  `checkbox_anonymous` tinyint(4) DEFAULT '0',
  `checkbox_tiecoordinates` tinyint(4) DEFAULT '0',
  `checkbox_nogps` tinyint(4) DEFAULT '0',
  `information_ipaddress` text NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
)

我怎样才能做到这一点？

【问题讨论】：

尝试对表名使用反引号。

谢谢，但这并没有解决问题。我收到了同样的错误信息

在 WHERE 之前使用 ON 条件。

@Mihai ... ON information_ipaddress = :ipaddress WHERE ...?

【参考方案1】：

试试这个：

DELETE l, m
FROM visitors_list AS l
INNER JOIN visitors_main AS m ON l.information_ipaddress = m.information_ipaddress
WHERE l.information_ipaddress = :ipaddress
AND l.datetime_lastactive < NOW() - INTERVAL 3 HOUR;

【讨论】：

谢谢！但我只收到Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'information_ipaddress' in where clause is ambiguous' in ...。为什么DELETE visitors_list？我不想删除整个表。只是其中的数据（以及visitors_main）

@ErikEdgren - 这是因为两个表之间的外键约束，您也可以将 CASCADE DELETE 从另一个表中删除。但是您是要从两个表中删除还是只从其中一个表中删除？

我想从两个表中删除相同IP地址的数据。

@ErikEdgren - OK 抱歉，然后将连接条件更改为该列information_ipaddress，然后将删除两个表中的所有匹配列。

谢谢，但我一直收到相同的错误消息 - Integrity constraint violation: 1052 Column 'information_ipaddress' in where clause is ambiguous' :/ CASCADE DELETE visitors_list FROM visitors_list ... 也不起作用； Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CASCADE DELETE visitors_list FROM visitors_list INNER JOIN visitors_main ON vi' at line 1'

【参考方案2】：

DELETE v1,v2
FROM visitors_list v1
INNER JOIN visitors_main v2 ON v1.id_visitor = v2.id
WHERE v1.information_ipaddress = :ipaddress
AND v1.datetime_lastactive < NOW() - INTERVAL 3 HOUR;

【讨论】：

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'visitors_list.information_ipaddress' in 'where clause'' in ...