23 октября
2013
Запрос на модуле
Задание:
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#]
78 total views, 1 views today
Задание:
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#]
78 total views, 1 views today