Table: coimbatore_junction_trains
Columns: train_no
train_name
destination
category
frequency

Question: What is the category for trains numbered 16609/16610?
SQL: SELECT "category" FROM coimbatore_junction_trains WHERE "train_no" = '16609/16610'

Question: What trains have a category of express and a weekly frequency?
SQL: SELECT "train_name" FROM coimbatore_junction_trains WHERE "category" = 'Express' AND "frequency" = 'Weekly'

Question: What is the train name that has a destination of Tuticorin?
SQL: SELECT "train_name" FROM coimbatore_junction_trains WHERE "destination" = 'Tuticorin'

Question: What is the frequency of trains numbered 12671/12672?
SQL: SELECT "frequency" FROM coimbatore_junction_trains WHERE "train_no" = '12671/12672'

Question: How many destinations have a weekly frequency and are named AC Express?
SQL: SELECT COUNT("destination") FROM coimbatore_junction_trains WHERE "frequency" = 'Weekly' AND "train_name" = 'AC Express'

Question: What is the number of frequencies that have a destination of Jaipur?
SQL: SELECT COUNT("frequency") FROM coimbatore_junction_trains WHERE "destination" = 'Jaipur'