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filipmadeja4
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Nowy projekt bazy
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CREATE DATABASE nazwa;
Wybranie konkretnej bazy
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USE nazwa;
Stworzenie tabeli
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CREATE TABLE nazwa (kolumna1 TYP dodatkowe)
Typy i dodatkowe:
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INT, VARCHAR(50), DATE, auto_increment, PRIMARY KEY, DEAFULT 'cos', NOT NULL
Zmiana struktury tabeli (Dodawanie)
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ALTER TABLE tabela ADD nowa_kolumna TYP;
Zmiana struktury tabeli (Usuwanie)
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ALTER TABLE tabela DROP COLUMN nazwa;
Zmiana struktury tabeli (zmiana)
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ALTER TABLE tabela CHANGE stara_nazwa nowa_nazwa TYP;
Usunięcie całej tabeli lub bazy
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DROP TABLE/DATABASE nazwa;
Wstaw nowy wiersz z danymi do rekordu (wierszu)
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INSERT INTO tabela (kolumna1, kolumna2) VALUES ('tekst', 100);
Zmiana danych które są już w tabeli
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UPDATE tabela SET kolumna = 'nowa_wartosc' WHERE id = 1;
Usunięcie wiersza
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DELETE FROM tabela WHERE id = 1;
Wybierz kolumny które chcesz zobaczyć
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SELECT * lub SELECT imie, nazwisko
Z której tabeli brać dane
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FROM
Szuka tekstu według wzoru
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LIKE 'A%'
Sortuje wyniki
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ORDER BY ASC(Rosnąco) DESC(malejąco)
Usuwa powtórki
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DISTINCT
Wyświetla tylko określoną liczbę wierszy
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LIMIT
Skleja dwa pola w jedno
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CONCAT(imie, ' ', nazwisko)
Dzialania matematyczne
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SELECT kolumna, (kolumna operator liczba) AS nowa_nazwa FROM tabela;
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