Table: fighter_match_8
Columns: res
record
opponent
method
event
round
time
location

Question: What is the total number of Round that has a Time of 6:04?
SQL: SELECT SUM("round") FROM fighter_match_8 WHERE "time" = '6:04'

Question: What Round has the Method of Submission (Single Wing Choke)?
SQL: SELECT "round" FROM fighter_match_8 WHERE "method" = 'submission (single wing choke)'