Table: radio_stations_7
Columns: call_sign
frequency_mhz
city_of_license
erp_w
height_m_ft
fcc_info

Question: How many ERP W is it that has a Call sign of w273bs?
SQL: SELECT SUM("erp_w") FROM radio_stations_7 WHERE "call_sign" = 'w273bs'

Question: Which City of license has a Frequency MHz smaller than 100.9, and a ERP W larger than 100?
SQL: SELECT "city_of_license" FROM radio_stations_7 WHERE "frequency_mhz" < 100.9 AND "erp_w" > 100

Question: What is the number of Frequency MHz in woodstock, georgia?
SQL: SELECT SUM("frequency_mhz") FROM radio_stations_7 WHERE "city_of_license" = 'woodstock, georgia'

Question: What is the lowest ERP W of  w223bp?
SQL: SELECT MIN("erp_w") FROM radio_stations_7 WHERE "call_sign" = 'w223bp'