CREATE TABLE table_name_50 (frequency VARCHAR2, power__kw_ VARCHAR2, call_sign VARCHAR2)

What's the frequency of the call sign DYFR with 10KW of power?
SELECT frequency FROM table_name_50 WHERE power__kw_ = "10kw" AND call_sign = "dyfr"
SELECT "frequency" FROM "table_name_50" WHERE "10kw" = "power__kw_" AND "call_sign" = "dyfr"