December 2007
Intermediate to advanced
160 pages
2h 21m
Polish
Content preview from MySQL. Leksykon kieszonkowy. II wydanie
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Rozdział 5. Operatory
MySQL zawiera trzy grupy operatorów: operatory arytmetyczne, porównania oraz operatory logiczne.
Priorytety operatorów
Jeśli kod SQL zawiera złożone wyrażenia, poszczególne ich części są obliczane na podstawie priorytetów operatorów MySQL. Można oczywiście wymusić inną kolejność wykonywania działań, stosując nawiasy.
BINARY,COLLATE!--(jednoargumentowy minus),~(jednoargumentowa negacja bitowa)^* / % DIV MOD+ -<< >>&|< <= > >= = <=> <> IN IS LIKE REGEXPBETWEEN CASE WHEN THEN ELSENOT&& AND|| OR XOR:=
Operatory arytmetyczne
Operatory arytmetyczne wykonują podstawowe działania na dwóch wartościach.
| Dodaje do siebie dwie liczby. |
| Odejmuje od siebie dwie liczby. |
| Mnoży dwie liczby przez siebie. |
| Dzieli dwie liczby przez siebie. |
|
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