res.txt

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

# Write your MySQL query statement below
DELETE a
FROM Person a, Person b
WHERE a.Email = b.Email AND
a.Id > b.Id;