Deleting duplicates from a large table

Question

I have quite a large table with 19 000 000 records, and I have problem with duplicate rows. There\'s a lot of similar questions even here in SO, but none of them seems to gi

Answer 1

You can delete duplicates using these steps: 1- Export the following query's results into a txt file:

select dup_col from table1 group by dup_col having count(dup_col) > 1

2- Add this to the first of above txt file and run the final query:

delete from table1 where dup_col in (.....)

Please note that '...' is the contents of txt file created in the first step.