SELECT k.nazwa, d.czasdostawy, d.towar
t. kod, t.nazwa,
ROUND((((avg(o.rozchodwartosc)-avg(o.przychodwartosc))/avg(o.rozchodwartosc))*100),2)
AS "MARZA [%]",
ROUND((((avg(o.rozchodwartosc)-avg(o.przychodwartosc))/avg(o.przychodwartosc))*100),2)
AS "NARZUT [%]"
FROM KONTRAHENCI k obroty o JOIN DOSTAWCYTOWARU d towary t
ON k.id=d.kontrahenci_id
WHERE d.towar=2;o.TOWAR=t.id
GROUP BY t.kod, t.nazwa;
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