[GetSQLMySQLI] Blad..(Nie).<B><pre>select 
concat(left(kiedy,13),':00') as kiedy,
ROUND(avg(cz.pm10),2) as pm10, 
round(avg(cz.pm2_5),2) as pm25,
LEFT(Kiedy, 14) as cza
from czujniki cz 
where cz.czujnikid=4377729
and cz.pm10 >-1
group by cza
order by cza desc
limit 101</pre></b>	: