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4.1
SELECT Druzyny as Druzyna, COUNT(Id_harcerza) as ile_osob
FROM harcerze
GROUP BY Druzyna;

Wynik:

Druzyna ile_osob
Bukowina 26
Grot 12
Jaworzyna 49
Plomien 16
Watra 14
Wierchy 42
Zawisza 11
Zywioly 17

4.2
(SELECT Nazwa_sprawnosci, SUM(l_punktow) AS liczba_punktow
FROM sprawnosc
INNER JOIN dzialania USING(Id_sprawnosci)
GROUP BY Nazwa_sprawnosci
ORDER BY liczba_punktow DESC
LIMIT 1)
UNION
(SELECT Nazwa_sprawnosci, SUM(l_punktow) AS liczba_punktow
FROM sprawnosc
INNER JOIN dzialania USING(Id_sprawnosci)
GROUP BY Nazwa_sprawnosci
ORDER BY liczba_punktow ASC
LIMIT 1);

Wynik:

Nazwa_sprawnosci liczba_punktow(Rosnąco)
tropiciel 45035
ratownik 4263


4.3
SELECT Imie, Nazwisko, COUNT(DISTINCT Id_sprawnosci) AS Liczba_sprawnosci
FROM harcerze
LEFT JOIN dzialania
USING(Id_harcerza)
GROUP BY Id_harcerza
ORDER BY Liczba_sprawnosci DESC;

Wynik:

Imie Nazwisko Liczba_sprawnosci (Malejąco)
Marian Majchrowicz 5
Mateusz Buczek 5
Krzysztof Bartodziej 4
Maciej Linus 4
Zofia Barszczewska 4
Dariusz Salezy 4
Kamil Banasiewicz 4
Ewelina Miejska 4
Kamila Przybyla 4
Janina Koszewska 4
Janusz Lichwiarz 4
Leon Piotrowski 4
Zuzanna Sliwinska 4
Helena Kowalska 4
Marta Kumor 4
Anna Miekus 4
Iza Pankiewicz 4
Karina Figura 4
Jolanta Filipowicz 4
Robert Banaszczyk 4
Patrycja Barcisz 4
Teresa Damska 3
Grzegorz Aniol 3
Aneta Wolej 3
Barbara Solska 3



     
 
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