MySQL 删除-Select 行

Question

我正在尝试从 table subscription 中删除一行，其中有两个外键 (id_user 和 id_journal）。我的信息是 email 来自 table user 和 nome 来自 table 期刊。删除的行需要匹配user.email和journal.nome。我找不到解决办法。我该怎么做？

Table 用户：

id
name
email
password

Table 期刊：

id
name

Table 订阅：

id
id_user
id_journal

我尝试的最后两个查询：

DELETE FROM assinatura WHERE (
SELECT  tbluser.id, journal.id
FROM    tbluser, journal
WHERE email = '$email' AND nome = '$nome')

DELETE FROM assinatura 
INNER JOIN tbluser on (tbluser.email = '$email')
INNER JOIN journal on (journal.nome = '$nome')

我尝试了很多其他查询，但都没有成功。我认为重要的是要说我是 MySQL.

的新人

Answer 1

DELETE 
FROM Subscription
WHERE id_user IN (
   SELECT      usr.id 
   FROM        user AS usr 
   WHERE       usr.email = INPUT_EMAIL
) 
AND id_journal IN (
   SELECT      jrnl.id 
   FROM        journal AS jrnl 
   WHERE       jrnl.name = INPUT_NAME
)

Answer 2

关于另一个话题...

尽量避免

对相同user/journal组合的过度订阅

CREATE TABLE subscription
(
  id int NOT NULL AUTO_INCREMENT primary key,
  id_user int not null,
  id_journal int not null,
  UNIQUE KEY `user_journal_intersect` (`id_user`,`id_journal`)
  -- note Alan stated FK RI in place already
);

你当然可以在复合材料上进行 PK（放弃 id 列），程序员偏好

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