user: Question: What is the least ERP W when the freguency MHz is 89.3 FM?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['K206BP', '89.1 FM', 'Weslaco, TX', 197.0, 'FCC']
SQL:

assistant: SELECT MIN("ERP W") FROM "Table" WHERE "Frequency MHz" = '89.3 FM';