Table: rowing_2008_womens_single
Columns: rank
athlete
country
time
notes

Question: What country is the athlete ekaterina karsten from with a rank less than 4?
SQL: SELECT "country" FROM rowing_2008_womens_single WHERE "rank" < 4 AND "athlete" = 'ekaterina karsten'

Question: What is the time of frida svensson's race that had sa/b under the notes?
SQL: SELECT "time" FROM rowing_2008_womens_single WHERE "notes" = 'sa/b' AND "athlete" = 'frida svensson'

Question: What is the race time for emma twigg?
SQL: SELECT "time" FROM rowing_2008_womens_single WHERE "athlete" = 'emma twigg'

Question: What is the total rank for the athlete that had a race time of 7:34.24?
SQL: SELECT COUNT("rank") FROM rowing_2008_womens_single WHERE "time" = '7:34.24'