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

Question: What is the highest round in the Wec 25 match in Las Vegas, Nevada, United States?
SQL: SELECT MAX("round") FROM mma_fights WHERE "location" = 'las vegas, nevada, united states' AND "event" = 'wec 25'

Question: What event had 1 round and a record of 6-2?
SQL: SELECT "event" FROM mma_fights WHERE "round" = 1 AND "record" = '6-2'