I have a select query (inner join) where I want the last rows inserted (matching criteria), so there is a ORDER BY table.id DESC
Problem is that with this order, query time: 1.515625 seconds.
If I don’t add any order, so it uses default ASC, query: 0.09375 seconds. (But I get the oldest ones, which I don’t want)
I must not use ORDER BY table.id DESC due to the query time, so I went to phpmyadmin and I tried this ALTER TABLE table ORDER BY id DESC ; it says successfully executed, but not really, it appears in ASC order anyways.
That’s the first problem, then I read that you cannot insert or delete data if you want to maintain the DESC order?
There must be a way, because “query time: 1.515625 seconds” is not an option (table will get bigger).
PD: Is an InnoDB table.
First problem “solved”: ‘ORDER BY does not make sense for InnoDB tables because InnoDB always orders table rows according to the clustered index.’
OK getting somewhere now: https://www.google.com/search?q=inner%20join%20order%20by%20desc%20slow&rct=j
With now order: “Using index”, with DESC “Using index; Using temporary; Using filesort”