Table: portsmouth_1949_50_matches
Columns: opposing_team
against
date
venue
round

Question: Which Opposing Team has an Against of 3, and a Date of 11 february 1950?
SQL: SELECT "opposing_team" FROM portsmouth_1949_50_matches WHERE "against" = 3 AND "date" = '11 february 1950'

Question: Which Venue has an Opposing Team of manchester united, and a Round of 5th round replay?
SQL: SELECT "venue" FROM portsmouth_1949_50_matches WHERE "opposing_team" = 'manchester united' AND "round" = '5th round replay'

Question: Which Against has a Date of 28 january 1950?
SQL: SELECT AVG("against") FROM portsmouth_1949_50_matches WHERE "date" = '28 january 1950'