Find and remove duplicate rows by two columns

Question

I read all the relevant duplicated questions/answers and I found this to be the most relevant answer:

INSERT IGNORE INTO temp(MAILING_ID,REPORT_ID) 
SELECT DISTI         


        

Answer 1

you can always get the primary ids by grouping that two unique fields

select count(*), id as count from table group by col a, col b having count(*)>1;

and then

delete from table where id in ( select count(*), id as count from table group by col a, col b having count(*)>1) limit maxlimit;

you can also use max() in place of limit