1.
SELECT YEAR(e.data) AS "Rok", p.`nazwa-p` AS "Nazwa przedmiotu", COUNT(DISTINCT e.`id-student`) AS "Ilosc zdanych egzaminow" FROM egzaminy e
JOIN przedmioty p ON p.`id-przedmiot`=e.`id-przedmiot`
WHERE p.`nazwa-p` LIKE "Arkusze kalkulacyjne" AND e.zdal="y"
GROUP BY YEAR(e.data)
HAVING COUNT(e.`id-student`)=(SELECT COUNT(DISTINCT e.`id-student`) FROM egzaminy e
JOIN przedmioty p ON p.`id-przedmiot`=e.`id-przedmiot`
WHERE p.`nazwa-p` LIKE "Arkusze kalkulacyjne" AND e.zdal="y"
GROUP BY YEAR(e.data) ORDER BY 1 ASC LIMIT 1)
ORDER BY YEAR(e.data)
3.
SELECT DISTINCT p.`id-przedmiot` AS "ID przedmiotu", p.`nazwa-p` AS "Nazwa przedmiotu", w.`id-wykladowcy` AS "ID Wykładowcy", CONCAT(w.nazwisko," ", w.imie) AS "Nazwisko i imię wykładowcy", e.data AS "Data ostatniego egzaminu" FROM egzaminy e
JOIN przedmioty p ON p.`id-przedmiot`=e.`id-przedmiot`
JOIN wykladowcy w ON w.`id-wykladowcy`=e.`id-wykladowca`
WHERE e.data=(SELECT DATA FROM egzaminy
WHERE `id-przedmiot`=e.`id-przedmiot`
ORDER BY DATA DESC LIMIT 1)
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