CREATE TABLE table_30939 ("Home team" CLOB, "Home team score" CLOB, "Away team" CLOB, "Away team score" CLOB, "Ground" CLOB, "Date" CLOB)

Which team was the away team when home team was essendon?
SELECT "Away team" FROM table_30939 WHERE "Home team" = 'Essendon'
SELECT "Away team" FROM "table_30939" WHERE "Home team" = 'Essendon'