Leetcode Delete Duplicate Emails problem solution YASH PAL, 31 July 2024 In this Leetcode Delete Duplicate Emails problem solution we need to write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. Topics we are covering Toggle First Problem solution.Second Problem solution.Third Problem solution. First Problem solution. delete from Person where Id in (select r.Id from (select Id, row_number() over(partition by Email order by Id ) as rk from Person) r where r.rk > 1 ); Second Problem solution. DELETE b FROM Person a, Person b WHERE a.Email = b.Email AND a.Id < b.Id; Third Problem solution. delete from Person where Id not in (select mid from (select min(Id) as mid from Person group by Email)T ) coding problems solutions