Question

I’m using this query to list duplicate records

SELECT DISTINCT column1 from table
group by column1 HAVING count(column1) > 1

for my specific query

SELECT DISTINCT ReportingDetailID from reportingdetail group by ReportingDetailID  HAVING count(ReportingDetailID) > 1;

works great!

now I need to delete duplicate entries, to end up with nice and clean table

I’m looking at the query here

DELETE FROM table_name 
USING table_name, table_name AS vtable 
WHERE 
    (table_name.id > vtable.id) 
AND (table_name.req_field=req_field)

According to query author “Replace req_field and table_name – should work without any issues”

I just don’t understand how can I get it to work on my db

my table name is reportingdetail and column name is reportingdetailID

+-------------------+
| ReportingDetailID |
+-------------------+
|         664602311 | 
|         664602311 | 
|         664602311 | 
|         664602311 | 
+-------------------+

Delete all duplicates but keep one

Thank you

Answer 1

The basic principle to delete the duplicate rows…

CREATE TEMPORARY TABLE tmptbl AS SELECT DISTINCT * FROM myTabs;
DELETE FROM myTabs;
INSERT INTO myTabs SELECT * FROM tmptbl;

For above I have myTabs as Table with Id as column where Id were duplicated.

Please do changes as per your requirement…