SELECT POLOZKA, CENA, COUNT(*) AS POCET
FROM TAB
GROUP BY POLOZKA, CENA
HAVING COUNT(*) > 1
edit: neviem ci som ta spravne pochopil, skus to lepsie opisat
SELECT POLOZKA, CENA, COUNT(*) AS POCET
FROM TAB
GROUP BY POLOZKA, CENA
HAVING COUNT(*) > 1
edit: neviem ci som ta spravne pochopil, skus to lepsie opisat