refactor 196

Author: fishercoder1534

database/_196.sql

@@ -1,21 +1 @@
--- 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]  |
--- +----+------------------+
-
--- # Write your MySQL query statement below
 delete p1 from Person p1, Person p2 where p1.Email = p2.Email and p1.Id > p2.Id