Rory O'Connor writes:
I want to leave one record behind, but delete all other records that
have the same e-mail address. Is there a standard query for this or do
I need to write a script that will do it?
Getting a list of the duplicate rows is simple enough, but
deleting them requires a
ALTER IGNORE TABLE mytable ADD UNIQUE (email);
will both add a unique key ( which will avoide this problem in the
future ) and delete the duplicates.
Rory O'Connor wrote:
excuse me if this is too newbie...but I need to perform a duplicate
delete on my database using the e-mail address as
excuse me if this is too newbie...but I need to perform a duplicate
delete on my database using the e-mail address as the key. I understnad
how to use COUNT and DISTINCT together...
select count(DISTINCT email) FROM table;
but I can't seem to find any info on how to perform the actual
: duplicate delete query
excuse me if this is too newbie...but I need to perform a duplicate
delete on my database using the e-mail address as the key. I understnad
how to use COUNT and DISTINCT together...
select count(DISTINCT email) FROM table;
but I can't seem to find any info on how
all records which have duplicates, or do you want
to
delete all the duplicates but leaving one copy of each duplicated
record
behind?
- Original Message -
From: Rory O'Connor [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 30, 2001 4:50 PM
Subject: duplicate delete query
