Задание:
Вариант 1:
T1 := S JOIN P WHERE S.CITY = P.CITY
T2 := T1 JOIN J WHERE T1.CITY = J.CITY
T3 := ( T2 JOIN SPJ ) [S#, P#, J#]
Задание:
Вариант 1:
T1 := S JOIN P WHERE S.CITY = P.CITY
T2 := T1 JOIN J WHERE T1.CITY = J.CITY
T3 := ( T2 JOIN SPJ ) [S#, P#, J#]
