user: Question: What is the Catalog number of the CD single?
Columns: ['Date', 'Label', 'Region', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['October 1996', 'Polydor', 'France, Belgium', 'CD single - Promo', '3459']
SQL:

assistant: SELECT "Catalog" FROM "Table" WHERE "Format" = 'CD single';