需要 SQL Query 帮助并显示错误消息子查询返回超过 1 行答案

【问题标题】：Need assistance with SQL Query with error message Subquery returns more than 1 row需要 SQL Query 帮助并显示错误消息子查询返回超过 1 行
【发布时间】：2023-03-29 01:54:01
【问题描述】：

我有两张表，我想通过根据匹配的 voteid 检索分配（预算）来更新费用的运行余额

我正在使用 phpmyadmin mysql

Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/7.4.6
数据库客户端版本：libmysql - mysqlnd 7.4.6
PHP 扩展：mysqli 文档 curl 文档 mbstring 文档
PHP 版本：7.4.6
服务器类型：MariaDB

这是我目前的 SQL 语句

SELECT allocation 
FROM vote 
INNER JOIN expenditure ON vote.voteid = expenditure.voteid 
GROUP BY vote.voteid;

SET @csum = (SELECT allocation 
             FROM vote 
             INNER JOIN expenditure ON vote.voteid = expenditure.voteid 
             GROUP BY vote.voteid);

UPDATE expenditure 
SET balance = (@csum = @csum - expenses) OVER (partition BY voteid ORDER BY expenditureid) AS balance;

错误信息：

子查询返回多于 1 行

表 1

| voteid | allocation |
+--------+------------+
| 1      | 50000      |
| 2      | 10000      |
| 3      | 34000      |
| 4      | 70000      |

表 2

    | expenditureid | voteid | expenses |
    +---------------+--------+----------+
    | 1             | 2      | 300      |
    | 2             | 2      | 650      |
    | 3             | 4      | 900      |
    | 4             | 4      | 1200     |
    | 5             | 3      | 34000    |

预期结果

+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| expenditureid | voteid | expenses | balance (running difference) | calculation (sample column should not be included)  |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
|               |        |          |                              | 10000                                               |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| 1             | 2      | 300      | 9700                         | (10000-300)                                        |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| 2             | 2      | 650      | 9050                         | (9700-650)                                          |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
|               |        |          |                              |                                                     |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
|               |        |          |                              | 70000                                               |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| 3             | 4      | 900      | 69100                        | (70000-900)                                         |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| 4             | 4      | 1200     | 67900                        | (69100-1200)                                        |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
|               |        |          |                              |                                                     |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
|               |        |          |                              | 34000                                               |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+
| 5             | 3      | 4000     | 30000                        | (34000-4000)                                        |
+---------------+--------+----------+------------------------------+-----------------------------------------------------+

【问题讨论】：

您的示例数据和计算毫无意义。我不知道balance 是如何计算的。
我是这个论坛的新手，所以请多多包涵。您是否在手机或笔记本电脑上查看此内容，因为由于某种原因，表格无法在手机上正确显示？所以我可以理解为什么你可能不明白余额是如何计算的。你看清楚桌子了吗？如果你不明白，我可以解释得更好
。 .我不确定论坛与它有多大关系。您有一行 300 作为费用，余额为 7000，表达式为 10,000 - 7,000。这 7,000 人完全是个谜。
对，你是完全正确的。计算是我的错误。我刚刚更新了它
但是你对我想要的结果有更好的理解吗？

标签： sql sql-update mariadb partitioning cumulative-sum

【解决方案1】：

total_allocation 不是您所显示的列。

你应该做的是：

SET @csum = (SELECT sum(vote.allocation) AS total_allocation 
             FROM vote 
             INNER JOIN expenditure ON vote.voteid = expenditure.voteid 
             GROUP BY vote.voteid);

【讨论】：