mysql - mysql 中的触发器插入多行而不是一行

Question

我正在尝试将来自 4 个不同表的 4 列的总和插入到单独表(名为 bugs)的触发器中，如下所示:

SELECT 
    uat_reopened_stats.release_name,
    (uat_reopened_stats.rate_bugs + qa_reopened_stats.rate_bugs + closed_reopened_stats.rate_bugs + done_reopened_stats.rate_bugs)
INTO @releasename, @bugstotalreopenrate  
FROM qa_reopened_stats
JOIN uat_reopened_stats 
    ON qa_reopened_stats.release_name = uat_reopened_stats.release_name
JOIN closed_reopened_stats 
    ON closed_reopened_stats.release_name = uat_reopened_stats.release_name
JOIN done_reopened_stats 
    ON done_reopened_stats.release_name = uat_reopened_stats.release_name;

INSERT INTO release_stats (release_name, bugs_total_reopen_rate)
VALUES (@releasename, @bugstotalreopenrate)
ON DUPLICATE KEY UPDATE 
    release_name=@releasename,
    bugs_total_reopen_rate=@bugstotalreopenrate;
END

但是，当执行触发器时(并且事先将 release_stats 表清空，我最终会得到 11 (!) 行!

MySQL [jira_statistics]> select * from release_stats;
+--------------+------------------------+
| release_name | bugs_total_reopen_rate |
+--------------+------------------------+
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
| 2.3.0        | 9.090909004211426      |
+--------------+------------------------+

为什么会发生这种情况？

Answer 1

由于某种原因，在将 release_name 设置为表 release_stats 上的主键后，问题消失了。