仅显示GROUP BY的最新结果

Question

I need to show only the most recent entries in the results I know I should do a join or inner join but cannot seem to get that to work properly. I am sure it is something simple I am over looking.

$result = mysql_query("SELECT * FROM form_2 GROUP BY jobname");

I am looking to get only the most resent result by jobname.

Right Now it displays the first entries with the same jobname I need the most recent. When someone added a comment the jobname is the consistent. And I need to just display the most recent entire to show the most recent comment added with that jobname.

Answer 1

Try this:

select form_2.*
from form_2
inner join (
    select jobname, max(awardedcon) as max_value
    from form_2
    group by jobname
) as a on form_2.jobname=a.jobname and form_2.awardedcon=a.max_value

I am assuming that awardedcon is an increasing value for each jobname ( ie the most recent entry for each jobname will have the biggest awardedcon value)

Hope this helps you.

Answer 2

SELECT jobname,
       max(awardedcon) as last_awardedcon
FROM form_2 
GROUP BY jobname
ORDER BY last_awardedcon DESC