Table: portsmouth_20072008_matches
Columns: opposing_team
against
date
venue
round

Question: Which round has an Opposing Team of manchester united?
SQL: SELECT "round" FROM portsmouth_20072008_matches WHERE "opposing_team" = 'manchester united'

Question: Which Date has an Against larger than 0?
SQL: SELECT "date" FROM portsmouth_20072008_matches WHERE "against" > 0

Question: Which Against has a Round of fourth round?
SQL: SELECT MIN("against") FROM portsmouth_20072008_matches WHERE "round" = 'fourth round'

Question: What was the venue on 17/02/2008?
SQL: SELECT "venue" FROM portsmouth_20072008_matches WHERE "date" = '17/02/2008'