Deleting duplicate record from table - SQL query

Question

I need to delete duplicate rows only from the table, like I have 3 duplicate rows in the table, my query will delete 2 rows from 3 duplicated rows.

How can I get this? P

Answer 1

I think each table has unique identifier. So if it exists then you can write following query: Delete Table1 from Table1 t1 where 2 >= (select count(id) from Table1 where dupColumn = t1.dupColumn) and t1.id not in (select max (id) from Table1 where dupColumn = t1.dupColumn)

OOps. It seems it is possible to use second filter only Delete Table1 from Table1 t1 where t1.id not in (select max (id) from Table1 where dupColumn = t1.dupColumn)