
Podstawowe zapytania SQL
Authored by Kamil Komorowski
Computers
11th Grade
Used 2+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Co robi klauzula WHERE w zapytaniu SQL?
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Jakie słowo kluczowe używasz, żeby połączyć dwie tabele i zwrócić tylko te wiersze, które mają dopasowane wartości w obu tabelach?
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Która z poniższych funkcji agregujących zwraca średnią wartość kolumny?
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Jaka klauzula pozwala na określenie warunku po agregacji (np. po GROUP BY)?
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Co zwraca COUNT(*)?
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Które JOIN zwróci wszystkie wiersze z lewej tabeli, nawet jeśli nie ma dopasowania w tabeli prawej?
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Czym różni się UNION od UNION ALL?
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