mysql - Query runs very slow -


i have query runs slow. goal of query list articles table , quantity table artikli. want see article sales listed in tables (artikli_2016 year, , artikli_2015 previous year)

select a.artid,    a.artsifra,    a.artnaziv,    a.artstanje,    a.artstanjepalete,    ( a.artstanje + a.artstanjepalete ) total,    sum(g.izlaz)                        promet,    c.jmoznaka,    sum(f.izlaz)                        promet   artikli        left join artikli_2016 g               on a.artid = g.artikal        left join artikli_2015 f               on a.artid = f.artikal        left join jed_mjere c               on a.artmjera = c.jmid  a.artroditelj != 0        , a.artaktivan group  a.artid order  a.artid asc

once join artikli_2015 gets slow. helpful if can give me advice or solution run query faster.

due 2 lots of multiple records (i suspect) need use couple of sub queries sums. assuming jed_mjere has @ 1 record each artmjera.

select a.artid,          a.artsifra,          a.artnaziv,         a.artstanje,         a.artstanjepalete,          (a.artstanje + a.artstanjepalete) total,          g.promet,         c.jmoznaka,         f.promet artikli  left outer join  (     select artikal, sum(izlaz) promet     artikli_2016     group artikal )   g  on a.artid = g.artikal  left outer join  (     select artikal, sum(izlaz) promet     artikli_2015     group artikal )   f  on a.artid = f.artikal  left outer join jed_mjere c on a.artmjera = c.jmid  a.artroditelj != 0  , a.artaktivan  order a.artid asc

if query dealing small number of records artikli (ie a.artroditelj != 0 , a.artaktivan excludes rows) maybe worth doing join exclude records in sub queries.

select a.artid,          a.artsifra,          a.artnaziv,         a.artstanje,         a.artstanjepalete,          (a.artstanje + a.artstanjepalete) total,          g.promet,         c.jmoznaka,         f.promet artikli  left outer join  (     select g.artikal, sum(g.izlaz) promet     artikli      inner join artikli_2016 g     on a.artid = g.artikal      a.artroditelj != 0      , a.artaktivan      group g.artikal )   g  on a.artid = g.artikal  left outer join  (     select f.artikal, sum(f.izlaz) promet     artikli      inner join artikli_2015 f     on a.artid = g.artikal      a.artroditelj != 0      , a.artaktivan      group f.artikal )   f  on a.artid = f.artikal  left outer join jed_mjere c on a.artmjera = c.jmid  a.artroditelj != 0  , a.artaktivan  order a.artid asc

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