Delete Duplicate emails

Moderate
0/80
Average time to solve is 20m

Problem statement 

 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  |
+----+------------------+

Note:

  Your output is the whole Person table after executing your sql. Use delete statement.
Solution
(100% EXP penalty)
Delete Duplicate emails
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