CREATE TABLE table_18333678_2 (departure VARCHAR2, arrival VARCHAR2, going_to VARCHAR2)

when does the train arriving at stamford east at 11.45 departure
SELECT departure FROM table_18333678_2 WHERE arrival = "11.45" AND going_to = "Stamford East"
SELECT "departure" FROM "table_18333678_2" WHERE "11.45" = "arrival" AND "Stamford East" = "going_to"