user: Question: Name the sum of frequency will call sign of K259AW
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['K265AA', 100.9, 'Chester, California', '25 s watt', 'D', 'FCC']
SQL:

assistant: SELECT SUM("Frequency MHz") FROM "Table" WHERE "Call sign" = 'K259AW';