Written in the front : I am "Sailing to the Sea" . This nickname comes from my name and the name of my girlfriend. I love technology, open source, and programming.
技术是开源的、知识是共享的.
This blog is a little summary and record of your own learning. If you are interested in Java and algorithms , you can follow my dynamics and we will learn together.
用知识改变命运，让我们的家人过上更好的生活.
MySQL encountered such an error during development 1093 - You can’t specify target table 'person' for update in FROM clause. Below, I will take a topic of Likou as an example for analysis.
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1. Source of the subject
+----+------------------+
| Id | Email |
+----+------------------+
| 1 | john@example.com |
| 2 | bob@example.com |
| 3 | john@example.com |
+----+------------------+
For example, after running your query, the Person table above should return the following rows:
+----+------------------+
| Id | Email |
+----+------------------+
| 1 | john@example.com |
| 2 | bob@example.com |
+----+------------------+
Tips :
- After executing the SQL, the output is the entire Person table.
- Use the delete statement.
Source: LeetCode
Link: https://leetcode-cn.com/problems/delete-duplicate-emails
Copyright is owned by LeetCode . For commercial reprints, please contact the official authorization. For non-commercial reprints, please indicate the source.
Two, error analysis
This is because MySQL does not allow you to update and delete a table at the same time, that is, you cannot modify or delete based on the result of a query
Three, the solution
使用中间表将查询结果再次SELECT即可避免这个报错。
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On the road of moving bricks, we work hard together and knock out our future with both hands!
Due to the limited level, this blog will inevitably have inadequacies. I hope you guys can give me your advice!