Table: patrick_sercu
Columns: name
nationality
races_won
races_ridden
win_average

Question: How many races did the German racer that won less than 10 races ride?
SQL: SELECT COUNT("races_ridden") FROM patrick_sercu WHERE "nationality" = 'german' AND "races_won" < 10

Question: What is the average win as a percentage of German racer Rudi Altig, who has ridden in over 79 races?
SQL: SELECT AVG("win_average") FROM patrick_sercu WHERE "nationality" = 'german' AND "name" = 'rudi altig' AND "races_ridden" > 79