Question

会员资格表：

CREATE TABLE `Consultant_Memberships` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(255) DEFAULT NULL,
  `membership_url` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ;

Memberships_List table：

CREATE TABLE `Consultant_Memberships_List` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `consultant_id` int(11) DEFAULT NULL,
  `membership_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

在“会员资格”表中，有一个“社团”列表，该成员可以成为其中的一部分。在选择时，然后将其添加到“Memberships_List”中，形式为：

id - 自动增量
consultant_id - 添加社团的用户的唯一ID
membership_id - 指成员资格表中的“id”。

我希望能够在下拉列表中显示用户尚未选择的成员资格。到目前为止我已经：

$query = $db->query("SELECT `Consultant_Memberships.`id`, `Consultant_Memberships`.`title` `FROM `Consultant_Memberships 
WHERE NOT EXISTS (SELECT `Consultant_Memberships`.`id`, `Consultant_Memberships`.`title` 
WHERE `Consultant_Memberships`.`id` = $user_id)");

我目前收到此错误，也不确定这是否是正确的查询：

PHP 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 'WHERE `Consultant_Memberships_List`.`id` = )' at line 1' in /Users/Sites/pages/medical.php:72
Stack trace:
#0 /Users/Sites/pages/medical.php(72): PDO->query('SELECT `Consult...')
#1 /Users/Sites/index.php(18): include('/Users/Site...')
#2 {main}
  thrown in /Users/Sites/pages/medical.php on line 72

Answer 1

FROM子查询中缺少

NOT EXISTS。

Answer 2

SELECT `Consultant_Memberships.`id`, `Consultant_Memberships`.`title` `FROM `Consultant_Memberships 
WHERE NOT EXISTS (SELECT `Consultant_Memberships`.`id`, `Consultant_Memberships`.`title` 
WHERE `Consultant_Memberships`.`id` = $user_id)

你有一个错误的语法尝试这样的事情我不是在写exect查询但是在sql小提琴中检查并且那是wrond

SELECT Consultant_Memberships.id, Consultant_Memberships.title FROM Consultant_Memberships 
WHERE NOT EXISTS (SELECT Consultant_Memberships.id, Consultant_Memberships.title from Consultant_Memberships
WHERE Consultant_Memberships.id = 1)

Answer 3

始终从突出显示的查询部分向左侧观察。你的情况

SELECT `Consultant_Memberships.`id`, `Consultant_Memberships`.`title`
`FROM <--- extra backtick
`Consultant_Memberships <--- unclosed backtick

顺便说一句，不要过度使用反引号。您的大多数字段都不需要

...你的查询完全搞砸了据我了解你的问题，它必须是

SELECT cm.id, title 
FROM Consultant_Memberships cm LEFT JOIN Consultant_Memberships_List
ON cm.id=membership_id WHERE membership_id IS NULL

请注意，您的问题与PDO无关这是很清楚的SQL查询问题。

Answer 4

请试试这个：

SELECT a.id, a.title 
FROM Consultant_Memberships a, Consultant_Memberships_List b
WHERE a.id <> b.consultant_id

您遇到语法错误的原因是因为如果您看到子查询，则会发现您没有在其中指定任何表格。

WHERE NOT EXISTS (SELECT `Consultant_Memberships`.`id`, `Consultant_Memberships`.`title` 
WHERE `Consultant_Memberships`.`id` = $user_id)

如果您需要更多帮助，请告诉我们......

...问候 Mr.777

选择From Where Notists查询

4 个答案: