MYSQL database :
Table = Table1 field = phone_number
I need to dedupe the table where phone_number is in multiple recs.
Dete (the second occurance of phone_number) from table1 where phone_number ( is in their twice)
I am lost on this one.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
Sorry sanjooz, but that query won't work. MySQL won't let you DELETE from a table that you reference in the same DELETE statement's sub-SELECT. You can use a VIEW to get around this, but the problem I'm running into is that the asker wants to keep the first row and get rid of the rest. My solution gets rid of all the duplicates except for the *last* entry.
This is the way i figured to do it.
delete id from table where id in (select min(id) from table group by phone_number having count(id) > 1)
is probabl the easist way to go. Once you've run that - do a check - because if there are more than two of the same duplocate - you will need to run the delete again (only deletes one of two duplicates)
select count(id) from table group by phone_number having count(id) > 1
Business Accounts
Answer for Membership
by: sanjoozPosted on 2009-09-02 at 11:35:29ID: 25244106
do you have a primary key in this table? is it anything other than phone_number? If so, assuming id is your primary key, this might work
delete from table1 where id > (select id from table1 where phone number = '1234567890' order by id limit 1)