user: Question: What is the call frequency sign of CJJC-FM?
Columns: ['Frequency', 'Call sign', 'Branding', 'Format', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AM 940', 'CJGX', 'GX94', 'country music', 'Harvard Broadcasting']
SQL:

assistant: SELECT "Frequency" FROM "Table" WHERE "Call sign" = 'CJJC-FM';