Table: mma_fights_14
Columns: res
record
opponent
method
event
round
time
location

Question: The tko (doctor stoppage) method was used in a loss against which opponent?
SQL: SELECT "opponent" FROM mma_fights_14 WHERE "method" = 'tko (doctor stoppage)' AND "res" = 'loss'

Question: How many total rounds used the submission (choke) method?
SQL: SELECT SUM("round") FROM mma_fights_14 WHERE "method" = 'submission (choke)'

Question: What was the time of the match with a record of 9-0 and used the tko (doctor stoppage) method?
SQL: SELECT "time" FROM mma_fights_14 WHERE "method" = 'tko (doctor stoppage)' AND "record" = '9-0'

Question: What was the lowest round number at the UFC 16 event with a record of 19-1-1?
SQL: SELECT MIN("round") FROM mma_fights_14 WHERE "event" = 'ufc 16' AND "record" = '19-1-1'