Table: christy_ekpukhon_2006_commonwealth
Columns: year
tournament
venue
result
extra

Question: What was the extra info for the Commonwealth Games?
SQL: SELECT "extra" FROM christy_ekpukhon_2006_commonwealth WHERE "tournament" = 'commonwealth games'

Question: What year was the Commonwealth Games?
SQL: SELECT SUM("year") FROM christy_ekpukhon_2006_commonwealth WHERE "tournament" = 'commonwealth games'