Table: fighter_match_6
Columns: res
record
opponent
method
event
round
time
location

Question: Name the opponent with round of 1 and time of n/a
SQL: SELECT "opponent" FROM fighter_match_6 WHERE "round" = '1' AND "time" = 'n/a'

Question: Name the record with opponent of christian nielson
SQL: SELECT "record" FROM fighter_match_6 WHERE "opponent" = 'christian nielson'

Question: Name the opponent with decision
SQL: SELECT "opponent" FROM fighter_match_6 WHERE "method" = 'decision'