sql - 连接问题，SQL 语句

Question

我正在尝试编写 SQL 语句，但遇到了麻烦。我有以下表格

笔记

person_user VARCHAR
message VARCHAR
time DATETIME
id INT (primary Key)

人

name (primary key)
address VARCHAR
telephone INT

有关联

person_associating VARCHAR
person_associating_with VARCHAR

我需要出现笔记，只有表格中写person_associating_with的笔记。Associated_With

这是我现在的尝试：

SELECT * 
FROM Notes 
INNER JOIN Notes.person_user ON Notes.id AS associatedMessages
INNER JOIN Associated_With On associatedMessages
WHERE 
     Person.name = person_associating
ORDER BY 
     time DESC;

目前，无论查询如何，我都会返回所有可能的结果

Answer 1

我假设您正在寻找以下内容：

SELECT *
FROM Notes AS ABB2 
   JOIN Associated_With AS ABB1 ON 
       ABB1.person_associating_with = ABB2.person_user
ORDER BY time DESC

在您的原始查询中，您尝试连接具有 ON 条件和 WHERE 条件的表。虽然可以这样做，但最好使用其中一种以保持一致性。

Answer 2

如果我理解正确，您可能不是在寻找联接，而是在寻找 IN 语句：

SELECT *
FROM Notes
WHERE person_user IN
    (SELECT person_associating_with
     FROM Associated_With);