Table: wellington_phoenix_season
Columns: date
round
attendance
opposition
stadium

Question: Who's the opposition at westpac stadium when the attendance is 31,853?
SQL: SELECT "opposition" FROM wellington_phoenix_season WHERE "stadium" = 'westpac stadium' AND "attendance" = '31,853'

Question: When was the opposition sydney fc on round 19?
SQL: SELECT "date" FROM wellington_phoenix_season WHERE "opposition" = 'sydney fc' AND "round" = 'round 19'

Question: What round was adelaide united the opposition with an attendance of 18,345?
SQL: SELECT "round" FROM wellington_phoenix_season WHERE "opposition" = 'adelaide united' AND "attendance" = '18,345'

Question: Who was the opposition at 11,682 excl. exhibition match?
SQL: SELECT "opposition" FROM wellington_phoenix_season WHERE "stadium" = '11,682 excl. exhibition match'

Question: What round has an attendance of 12,127?
SQL: SELECT "round" FROM wellington_phoenix_season WHERE "attendance" = '12,127'