Table: justin_levens_fight_results
Columns: res
record
opponent
method
event
round
location

Question: How many rounds did the IFL: Oakland event have?
SQL: SELECT SUM("round") FROM justin_levens_fight_results WHERE "event" = 'ifl: oakland'

Question: Which opponent has a record of 3-0?
SQL: SELECT "opponent" FROM justin_levens_fight_results WHERE "record" = '3-0'