Leetcode刷题95-196. 删除重复的电子邮箱(MySQL解法！！！)

Come from : [https://leetcode-cn.com/problems/delete-duplicate-emails/]

1.Question

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]  |
+----+------------------+

Note:

Your output is the whole Person table after executing your sql. Use delete statement.

2.Answer

easy 类型题目。简单的SQL语句查询（今天是水一下，哈哈，端午节快乐）.

AC代码如下：

# Write your MySQL query statement below
delete p1 from Person p1, Person p2
where p1.Email=p2.Email and p1.Id>p2.Id

3.我的收获

fighting。。。

2019/6/6 胡云层 于南京 95