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Bazy danych
Bazy danych
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DBMS to
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Database management system - to cały zbiór narzędzie bazy danych - od analitycznych przez zarządzanie - wszystko
Akronim kolejności klauzul
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Filipek Jest Wkurzony Gdyż Hce Obmacać Lamę
utwórz domenę wiek która będzie walidować aby wiek nie miał więcej niż 10 lat
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CREATE DOMAIN wiek_polaka AS INTEGER CHECK (VALUE >= 0 AND VALUE < = 10))
Przypisz domenę TEST do istniejącej tabeli OSOBY i kolumny WIEK
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ALTER TABLE Osoby ALTER COLUMN Wiek SET DATA TYPE TEST
Skopiuj tabelę osoby jako osoby3
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CREATE TABLE osoby3 AS TABLE osoby;
Zmień nazwę kolumny lata na wiek w tabeli osoby3
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ALTER TABLE osoby3 RENAME COLUMN lata TO wiek;
dodaj sprawdzenie do tabeli osoby 3 aby kolumna wiek nie miała mniej niż 0
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ALTER TABLE osoby3 ADD CONSTRAINT osoby3_wiek_nonneg CHECK (wiek >= 0);
Stwórz tabelę osoby3 która będzie miała id jako primary i auto_id jako foreign key
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CREATE TABLE osoby3 (id SERIAL PRIMARY KEY, auto_id INT REFERENCES auta(id) ON DELETE SET NULL)
Zwraca imię i nazwisko osób, których auto_id wskazuje na auto o marce Toyota.
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SELECT imie, nazwisko FROM osoby3 WHERE auto_id IN (SELECT id FROM auta WHERE marka = 'Toyota'
Zaktualizuj imię na Paweł w tabeli osoby3 kolumnie imię gdzie imię to Zbigniew
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UPDATE osoby3 SET imię='Pawel' WHERE imię='Zbigniew'
case sensitive w postgres jest
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