I use the following queries to delete duplicate rows:
$dbh->do( "ALTER IGNORE TABLE data ADD UNIQUE INDEX dupidx ( field1, field2, field3, field4 )" );
$dbh->do( "ALTER TABLE leads DROP INDEX dupidx" );
However, this way it preserves the oldest entry and deletes the following rows with same data. IS there a way to delete the old one and keep the newest row of the duplicates?
As long as this is done before the data is deleted from the main table ... your concept is right. I have simplified the code and have shown it below. Note: I am showing two different DELETE's
I'm trying, I really am. But I've seen so many wrong approaches involving date(time) boundaries I despair about my inability to explain it. I've seen quite a few recently that define a non-leap year as 364 days, or 366 days and the list goes on.
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