CREATE TABLE table_19231 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Ground" TEXT, "Crowd" FLOAT, "Date" TEXT, "Report" TEXT)

Who was the away team when Carlton was the home team?
SELECT "Away team" FROM table_19231 WHERE "Home team" = 'Carlton'
SELECT "Away team" FROM "table_19231" WHERE "Home team" = 'Carlton'