Table: train_schedule_4
Columns: platform
frequency_per_hour
destination
service_pattern
operator
line

Question: Where is the service pattern sydenham then fast to norwood junction?
SQL: SELECT "destination" FROM train_schedule_4 WHERE "service_pattern" = 'Sydenham then fast to Norwood Junction'

Question: How many platforms have a southern opertator and the pattern is all stations via clapham junction?
SQL: SELECT COUNT("platform") FROM train_schedule_4 WHERE "operator" = 'Southern' AND "service_pattern" = 'All stations via Clapham Junction'

Question: When London Bridge is the destination, what is the frequency?
SQL: SELECT "frequency_per_hour" FROM train_schedule_4 WHERE "destination" = 'London Bridge'

Question: When London Bridge is the destination, how many lines are there?
SQL: SELECT COUNT("line") FROM train_schedule_4 WHERE "destination" = 'London Bridge'

Question: When the service pattern is sydenham then fast to norwood junction, what is the destination?
SQL: SELECT "destination" FROM train_schedule_4 WHERE "service_pattern" = 'Sydenham then fast to Norwood Junction'