题目链接:https://leetcode.com/problems/delete-duplicate-emails/
题目:
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
+—-+——————+
| Id | Email |
+—-+——————+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] |
+—-+——————+
Id is the primary key column for this table.
For example, after running your query, the above Person table should have the following rows:
+—-+——————+
| Id | Email |
+—-+——————+
| 1 | [email protected] |
| 2 | [email protected] |
+—-+——————+
思路:
注意delete后面查询结构的用法。
算法:
delete p1 from Person p1 inner join Person p2 on p1.email=p2.email and p1.id>p2.id
时间: 2024-10-12 16:03:49