CREATE TABLE table_name_39 (home_team VARCHAR, away_team VARCHAR, date VARCHAR)

Who was the home team when Sheffield United was the away team and the date was also Sheffield United?
SELECT home_team FROM table_name_39 WHERE away_team = "sheffield united" AND date = "sheffield united"
SELECT "home_team" FROM "table_name_39" WHERE "away_team" = "sheffield united" AND "date" = "sheffield united"