Table: race_results_123
Columns: rider
manufacturer
laps
time
grid

Question: Can you tell me the Manufacturer that has the Rider of stefan bradl?
SQL: SELECT "manufacturer" FROM race_results_123 WHERE "rider" = 'stefan bradl'

Question: Can you tell me the highest Grid that has the Time of +15.532, and the Laps larger than 23?
SQL: SELECT MAX("grid") FROM race_results_123 WHERE "time" = '+15.532' AND "laps" > 23

Question: Can you tell me the sum of Grid that has the Time of +6.355, and the Laps larger than 23?
SQL: SELECT SUM("grid") FROM race_results_123 WHERE "time" = '+6.355' AND "laps" > 23