Table: wtachampionships
Columns: player
result
appeared
rr_w_l
rr_w_rate

Question: If the RR Rate is less than 0.75 with a result of RR:08,09, what is the average appeared?
SQL: SELECT AVG("appeared") FROM wtachampionships WHERE "rr_w_rate" < 0.75 AND "result" = 'rr:08,09'

Question: What's the total appeared that has an RR Rate less than 0.17?
SQL: SELECT SUM("appeared") FROM wtachampionships WHERE "rr_w_rate" < 0.17

Question: For Angelique Kerber who had an RR Rate of less than 0.33, what's the appeared?
SQL: SELECT SUM("appeared") FROM wtachampionships WHERE "rr_w_rate" < 0.33 AND "player" = 'angelique kerber'