Table: manu_93_94_games_2
Columns: date
round
opponents
h_a
result_f_a
attendance

Question: Which round has an H/A of H?
SQL: SELECT "round" FROM manu_93_94_games_2 WHERE "h_a" = 'h'

Question: Rich round has an H/A of A and the opponent Sheffield United?
SQL: SELECT "round" FROM manu_93_94_games_2 WHERE "h_a" = 'a' AND "opponents" = 'sheffield united'