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STRUCTURED QUERY LANGUAGE (strukturalny jezyk zapytan)
SQL jest jezykiem deklaratywnym, użytkownik (programista) opisuje warunki które musi spełniać wynik końcowy.
W wyswietlaniu tabeli wielkosc liter nie ma znaczenia
*/
1.Wyświetl wszytskie dane z tabeli miasta
SELECT * FROM miasta;
2.Wyswietl nazwy wysztkich miast
SELECT nazwaMiasta FROM miasta;
/* jesli interesują nas konkretne rekordy to stosujemy klauzule WHERE
*/
3. Wyświetl id i nazwy tego miasta dla ktorego id rowne jest 4
SELECT id_miasta, nazwaMiasta FROM miasta WHERE id_miasta = 4
/* Operatory porwnania
= jest rowne
> jest wieksze
< jest mniejsze
>= wieksze lub rowne
<= mniejsze lub rowne
<> jest rozne
!= jest rozne
Warunki wystepujace w klauzli WHERE mozemy laczyc za pomoca operatorów logicznych:
NOT - negacja logiczna
AND - iloczyn logiczny
OR - suma logiczna
*/
Pracujc ze stringami SQL ujmujemy je w '' albo ""
/* jesli pracujemy z typem daty to rownierz uzywamy '' lub ""
format daty w MySQL 'RRRR-MM-DD' '2012-08-31'
*/
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