MySQL Select rows on first occurrence of each unique value

Question

Let\'s say you have the following table (the column of interest here is cid):

+-----+-------+-------+-------+---------------------+-------------         


        

Answer 1

You could use a filtering join:

select  *
from    (
        select  cid
        ,       min(time) as min_time
        from    YourTable
        group by
                cid
        ) filter
join    YourTable yt
on      filter.cid = yt.cid
        and filter.min_time = yt.time