Question

I am trying to remove all results but the last 10 from a table. That shouldn’t be too hard, but they also have to match a certain criteria.

The table looks like this;

chat_id
location_id
user_id
message
created

Technically it has to remove everything with a specific location_id, and keep the last 10 records in the table.

Is this possible with the Active Record class?

THanks in advance

Answer 1

Not at all an optimal solution, but I guess this might help.

I’m assuming from your question that the criteria is a particular location_id.

If the created field is a timestamp field and by last 10 records, you mean the 10 most recent records, you can use a query similar to this:

DELETE FROM `table` 
WHERE created<
    (select min(a.cdate) from 
        (
         select b.created as cdate from `table` b
         where b.location_id=<<loc_id>>
         order by b.created desc limit 10
        ) a
    )
AND location_id=<<loc_id>>;