user: Question: Name the catalog for Alfa Records and CD format
Columns: ['Region', 'Date', 'Label', 'Format', 'Catalog', 'Note']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Japan', 'April 21, 1980', 'Alfa Records', 'stereo LP', 'ALR-6037', '30cm']
SQL:

assistant: SELECT "Catalog" FROM "Table" WHERE "Label" = 'Alfa Records' AND "Format" = 'CD';