Question

我有几个已加入的表。我试图只选择那些没有插入行的那些。

示例一。我选择这样的用户：

SELECT  *
FROM user_accounts AS ua
    INNER JOIN users AS u ON u.id = ua.user_id
    INNER JOIN account_profile_entries AS ape ON ape.user_account_id = ua.id
    INNER JOIN profile_entries AS pe ON pe.id = ape.profile_entry_id
WHERE pe.profile_field_id = 1227 AND pe.value_tinyint = 0;

在这个查询中，我的配置文件字段有1227，其值为0.一切正常。

示例二。我也做了类似的查询，但这次是value_tinyint = 0：

SELECT  *
FROM user_accounts AS ua
    INNER JOIN users AS u ON u.id = ua.user_id
    INNER JOIN account_profile_entries AS ape ON ape.user_account_id = ua.id
    INNER JOIN profile_entries AS pe ON pe.id = ape.profile_entry_id
WHERE pe.profile_field_id = 1227 AND pe.value_tinyint = 1;

在这种情况下也可以。

我被困的地方：

当我需要在pe.profile_field_id = 1227中没有条目（行）时选择user_accounts时，我陷入困境这是我到目前为止所尝试的：

SELECT *
FROM user_accounts AS ua
WHERE ua.id NOT IN (SELECT u.email AS UserEmail
FROM user_accounts AS ua
    INNER JOIN users AS u ON u.id = ua.user_id
    INNER JOIN account_profile_entries AS ape ON ape.user_account_id = ua.id
    INNER JOIN profile_entries AS pe ON pe.id = ape.profile_entry_id
 WHERE pe.profile_field_id = 1227)

但是此查询还会返回具有条目1227的用户。

如何修改该查询以仅返回那些在profile_entries表中没有该条目的用户？

Answer 1

看起来您正在选择电子邮件而不是ID。将您的查询更改为：

SELECT *
FROM user_accounts AS ua
WHERE ua.id NOT IN (SELECT u.id  
FROM user_accounts AS ua
    INNER JOIN users AS u ON u.id = ua.user_id
    INNER JOIN account_profile_entries AS ape ON ape.user_account_id = ua.id
    INNER JOIN profile_entries AS pe ON pe.id = ape.profile_entry_id
WHERE pe.profile_field_id = 1227)

Answer 2

如果行存在，您需要对表不使用LEFT JOIN操作：

SELECT *
  FROM user_accounts AS ua
 WHERE ua.id NOT IN 
         (SELECT u.id 
            FROM user_accounts AS ua
                 INNER JOIN users AS u ON u.id = ua.user_id
                 INNER JOIN account_profile_entries AS ape 
                    ON ape.user_account_id = ua.id
                 LEFT JOIN profile_entries AS pe 
                    ON pe.id = ape.profile_entry_id
                       AND pe.profile_field_id = 1227)

请注意，我还将pe.profile_field_id = 1227移动到了JOIN部分，因为如果您使用LEFT JOIN操作并且在左连接表上有连接，如果不再是左连接。

您还需要将子查询中的列更改为ID，因为它是您要与之比较的。

如果行不存在，请选择数据

2 个答案: