[LeetCode] Delete Duplicate Emails

阿新 • • 發佈：2017-10-24

rom log john tab bsp bob ping leetcode email

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.Id>P2.Id AND P1.Email=P2.Email;
# 1223 ms

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