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.
- mysql
/*
Success Detail:
Runtime: 1451 ms, faster than 56.85% of MySQL online submissions for Delete Duplicate Emails.
Memory Usage: 0 MB, less than 100% of MySQL online submissions for Delete Duplicate Emails.
*/
DELETE p1
FROM Person p1,
Person p2
WHERE p1.Email = p2.Email
AND p1.Id > p2.Id