【Leetcode】Delete Duplicate Emails
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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 | john@example.com |
| 2 | bob@example.com |
| 3 | john@example.com |
+—-+——————+
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 | john@example.com |
| 2 | bob@example.com |
+—-+——————+
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 0 0
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